I! Pretending to Be Reborn, Director of Doomsday Hoax

However, this clever liar, the fraudster who stole the identity of the country's prime minister, feels deep fear at this moment...

He didn't understand what happened, but the current situation in the world faintly reveals a smell that is familiar to him and makes him tremble!

If the cat has a bloodline suppression against the mouse, then this feeling is the master of the fraudster, overriding the descendants!

Mohan is the descendant who knelt down in front of the patriarch and couldn't even learn from him.

"My lord, my lord!"

The shout of the staff brought Mohan back to reality.

The staff officer urged anxiously: "My lord, there are already many voices of protest in the country. If we don't take measures, we don't have to wait for the sun to go out in eleven months. In two months, our country will suffer heavy losses! "

The Kangaroo Country is a tropical and temperate country. A large amount of land is located in the tropics and near the equator. Houses in these areas do not have any thermal insulation design.

Even, almost all houses are built for better heat dissipation and ventilation.

During the Little Ice Age, this structure will cause the interior to become an ice cave,

Even if a heating system is really installed, even if the room is filled with thermal insulation sheets, a gust of wind blows over, and the bone-chilling temperature of minus [-] or [-] degrees will kill people.

Mohan sighed deeply and said, "I suddenly remembered a word."

"The best liar can fool all the people some of the time, and some of the people all of the time, but not all of the people all of the time."

The staff officer didn't know why, and couldn't figure out Mohan's thoughts, so he asked, "My lord, what do you want to express?"

Mohan hesitated to speak, and finally ordered: "Call scientists, architects, etc., and call the state governors of the Kangaroo Federations. We... have to join this doomsday carnival."

"Doomsday carnival? This is a doomsday confrontation!" the staff officer emphasized.

"It's not important. Then, it's time for us to join the Doomsday Contest!"

Mohan stood up, his body trembling slightly.

Is the end really coming?

Capital Steel Group.

The arctic rail production department.

At the door of the department, there is a red-headed document issued by the Emergency Bureau, which clearly shows the requirements that the extremely cold steel needs to meet this time.

[In order to ensure the safety of train transportation on the surface, it is necessary to use extremely cold and reliable steel rails.

The steel rail needs to meet the characteristics of impact toughness not less than 230MJ per square meter at absolute zero, that is, minus 0.25 degrees.

Specific indicators need to meet the following standards:

The instantaneous strength varies according to the content of C(+), C「(+), Al(.) and V(+).

Yield point depending on V(+) content.

Relative shrinkage as a function of Al(+) and V(+) content.

The impact toughness KCU varies according to the content of C(.), Si(+), Al(+) and V(+) at minus two hundred degrees.

And the impact toughness KCU that changes according to c(.), Mn(+)x Si(+), 0(.), N(+) at absolute zero】

After receiving the order, the iron and steel group, which used to manufacture countless materials and parts for the National Aeronautics and Space Administration, immediately mobilized, selected a hundred mechanical elites from various departments and production lines, and established the Extreme Cold Zhagang Rail Production 0 doors.

At this moment, Wo Chengwenk was wearing a full set of safety work clothes, wrapped tightly, and was preparing to improve the process and test the technology of the newly produced steel.

This mechanical genius who participated in the design of the surface cladding and fuel base of the space agency's manned spacecraft has been troubled by the extremely cold steel rails for many days and nights.

He Yude, who was leaning on crutches, was in the reference room, looking up the specific ratio and performance of more than ten generations of bainitic steel subspecies these days.

With the gating system provided by Xu Qiu, many defects of the bainitic steel subspecies have been resolved, and the development speed has also increased significantly. In a short period of time, the bainitic steel subspecies have been updated and iterated more than ten times .At present, the extremely cold rail department of the Capital Iron and Steel Group is mainly operating in accordance with the production process of extremely cold and reliable rails.

They have tried several methods, but currently only about [-]% of the steel rails in the smelting furnace can withstand the initial test of toughness at minus two hundred degrees.

As for the temperature below minus two hundred degrees, and the completion of all the procedures of the entire test, it is still far away.

But at least, the development of extremely cold steel rails has a general direction!

He Yude is an engineer and mechanic of the older generation. Compared with a calculator, he is still accustomed to using paper, pen and abacus, no matter how troublesome the calculation is.

"Through the new process, the nitrogen content in our electric furnace steel has met the requirements, but with the introduction of other measures, the nitrogen content in the oxygen converter steel under ordinary smelting conditions does not exceed [-]%, which is still insufficient."

"And if the production is carried out according to the smelting process of titanium ore, the loss of soluble nitrogen will be accelerated..."

He Yude said to himself, he integrated the data of more than a dozen bainitic steels and conducted interactive analysis.

Using the measured rolling surface hardness, cold resistance, impact toughness and so on, the first order linear model is established.

What He Yude wants to determine now is the functional relationship between chemical element concentration and mechanical properties.

"Put unknown coefficients aside, recalculate coefficients that vary meaningfully, and examine leases, resulting in multiple correlation models..."

The individual interaction coefficient labels are marked on the paper.

pat pat pat.

The sound of the abacus kept ringing.

This old man, a mechanic and steel master who designed the advanced weapons of the Dragon Kingdom, is showing his unparalleled wisdom and desire for epoch-making materials.

dong dong dong.

At this time, there was a knock on the door.

"Xiao Wo, come in!" He Yude shouted with enthusiasm in his eyes.

There are not many people who can enter the reference room, and it will only be Wo Chengwen who comes at this time.

Wo Chengwen walked in, his hair was wet with sweat, his whole body seemed to be soaked in water, and he said with a disappointed expression: "He Lao, our No.13 generation bainite subspecies steel, or only through the first experiment, and it fell apart in the second experiment."

"Is this direction really the right one?"

He Yude ignored him, and the abacus in his hand became faster and faster, and numbers kept appearing in the draft book.

He Yude murmured in a low voice, "These data are connected together. Guess what I found. At about two hundred degrees below zero, the impact toughness of steel also decreases with the increase of carbon content!"

"The higher the proportion of aluminum in the steel alloy, the higher its impact toughness!"

"There's an extremely significant link between the two."

"One more thing you'd never think of, Copper J"

Wo Chengwen was stunned in place, and then he was pleasantly surprised, and ran over to check Wo Chengwen's draft paper.

"What is the property of a sail?"

He Yude explained: "Currently, mechanical properties have a positive effect on both hardness and impact toughness. That is to say, within a certain range, the higher the content of mechanical properties, the better, but the interaction between the three is tentatively considered If you don't come out, this range can't be determined!"

Wo Chengwen was very surprised and asked, "Where's the silicon?"

"Triggered from a plausible positive effect on impact toughness, it must be said that silicon is more influential than carbon.

According to the standard regression coefficient value, the contribution rate of silicon is [-] to [-] times higher than that of nitrogen under the condition of changing silicon and nitrogen within the research range.And carbon has a stronger negative effect, which is why silicon is more suitable for the products we want! "

Wo Chengwen was thinking. He recalled the bainite subspecies refined these days, and asked: "We have refined 0.25 batches of bainite subspecies. The nitrogen content and silicon content of these steels are very high. The impact toughness is not less than [-]MJ per square meter, but it collapsed in the second round of testing, could it be..... related to the carbon content?"

He Yude nodded, and said with approval: "I also remember these fifteen furnaces deeply."

"At the time we even thought success was within reach!"

"I recalled the chemical composition of these fifteen batches of steel. In addition to the high content of nitrogen and silicon, it also has a high content of carbon. If you think about it according to the current thinking, it is very likely that the strong negative impact of carbon has led to the high content of carbon. In the case of impact toughness, the steel collapses in the second round!"

After He Yude finished speaking hastily, the speed in his hands did not slow down at all, and he was still calculating quickly.

Wo Chengwen stopped talking, and carefully checked the formula on the draft paper, his eyes became more and more bright.

He Yude's old but steady voice sounded:

"Valuable information, you can see from this table, if you compare the last two rows, you can infer the changes in the functional roles of oxygen, nitrogen, and aluminum when the temperature drops to minus two hundred degrees."

"At room temperature, aluminum significantly improves toughness, which is due to its decomposition into finely dispersed aluminides, and thus particle refinement!"

"As a result, when it is two hundred degrees below zero, its influence is not obvious, and it even shows a tendency to deteriorate the toughness."

"Because of the formation of finely dispersed aluminides, at extremely cold temperatures, particle refinement has a beneficial effect on the increase in toughness levels, and at the same time confirms the benign role of nitrogen." Wo Chengwen clapped his hands excitedly and said:

"Oxygen!"

"Unlike at room temperature, in the extreme cold of minus [-] degrees, the total oxygen content has a negative impact on the toughness of the extremely cold reliable steel rails. This means that our previous approach may have made mistakes, and we must remove the steel. Oxygen inclusions of species can be deeply removed!"

He Yude is nodding, according to his interaction diagram, it is indeed so.

Below minus two hundred degrees, the inclusion of oxides will increase the damage process to the steel.

And the principle of this may still be related to aluminum.

Part of the aluminum goes into the oxide, forming aluminum oxide, and the formation of the same boundary between oxide and metal creates a damaged surface...

At this moment, Wo Chengwen and He Yude faced another choice.

The existence of aluminum and aluminide can confirm the benign effect of nitrogen, but at the same time, it will enhance the damage of oxygen to the toughness and hardness of steel!

This is a double-edged sword!

He Yude sighed deeply and said:

"Now there are two ways."

"The first one is to develop a process for deeply removing oxygen inclusions to produce oxygen-free steel."

"Second, is to directly remove the oxygen, or aluminum, from the chemical composition."

Wo Chengwen said solemnly: "If we can choose, we'd better improve the process. Oxygen and aluminum can essentially improve the toughness of steel. If you directly remove it roughly, it's not worth it!" He Yude shook his head,

"I have developed several material models these days, and used them to evaluate the toughness, plasticity, anisotropy, ductile damage and other aspects of high-temperature steel used to manufacture XI 00 steel pipelines."

"Including porosity nuclei, growth and merging, etc., combined with the characteristics of bainite steel subspecies, the material parameters have been determined and the model has been determined through mechanical performance tests and fracture detection..."

"Laboratory tests were performed on smooth and notched tensile specimens, plane strain specimens and C(T) specimens."

"Among them, I focused on testing the plasticity, toughness, and anisotropy of tensile samples along the three main directions, but conducted LT and "L configuration experiments on plane strain samples and C(T) samples... ..."

"In the final combined material model, plastic rheology and crack growth without brittle delamination can be observed through full 3D calculation."

"As a result, I found that the anisotropy model can be used to describe the plastic deformation, as well as the change of toughness, damage growth, impact toughness, etc., of material properties."

Wo Chengwen was stunned for a moment, he was amazed by this discovery. 〃Why can the anisotropic model describe these parameters? "

He Yude thought about it, and he said: "I guess, it is because the origin inclusions of ductile damage, such as CaS, TiN, iron-carbon compounds, and MA islands, all have isotropic shapes and isotropic effects.

"This is extremely useful for the bainitic steel subspecies with extensible sulfidation inclusions! Just like the Taiji diagram in our traditional culture of the Dragon Kingdom, Yin and Yang are intertwined!"