I! Pretending to Be Reborn, Director of Doomsday Hoax

All this information is integrated... The country is planning something that will change the entire urban pattern of mankind? !

Liaodong Qinggang Group Corporation.

Chairman Qiu Qingzhi felt his scalp tingle when he looked at the production requirements on the red-headed document. [Production demand entry:

Crude steel: 6000 million tons.

Angle steel: 3000 million tons.

round steel. 3000 million tons.

Rebar: 300 million tons.

Hot-dip pipe: 100 million tons.

Seamless pipe: 100 million tons. 】

"The annual crude steel output of our Qinggang Group was only 9000 million tons last year, not to mention angle steel and round steel..."

"And the target given to us by the Strategic Emergency Management Bureau is to complete the preparation of 6000 million tons of crude steel within half a year, and there is a huge amount of other steel products, half a year!"

Half a year will complete the previous year's workload!

Qiu Qing's head was going to turn white with worry.

He stared at the demand item, trying to get a glimpse of the country's plan from it.

Angle steel can be composed of various stress-bearing parts, and can also be used as a connector between components, and is widely used in various building structures and engineering structures.Such as beams, bridges, transmission towers, lifting and transportation equipment, industrial furnaces and reactors, etc.

And round steel, threaded steel etc., the former makes precise mechanical parts, and the latter can be used as the tensile stress bearing main body of large-scale, heavy thin-walled and high-rise building structure!

Qinggang Group was also required to produce a batch of thermal insulation materials, cold-resistant and cold-proof materials, waterproof and impermeable materials, wear-resistant and corrosion-resistant materials, etc...

Qiu Qingzhi deeply felt the heavy burden on his shoulders.

He smoked one cigarette after another, then dialed the manager of the administration department.

"Send the notice, Qinggang Group, starting at six o'clock tomorrow morning, will enter a wartime state."

"The daily working hours are increased to twelve hours, all of which are double wages."

"This time the country attaches great importance to our Qinggang Group and has given us a lot of indicators. We must complete the task with quality and quantity!"

When the manager of the administrative department heard the first half of the sentence, he still wanted to refute.

After all, the [-]-hour working system will cause employees to rebel!

But when he heard the double salary, his blood boiled immediately.

All working hours are calculated as double wages, twelve hours a day is too little! !

"Yes, leader! Guaranteed to complete the task!!"

Tsinghua University, School of Mechanics of Materials.

Professor Chen Yongsheng is testing a new type of three-dimensional graphene material in the laboratory.

Just a few months ago, he led the team to prepare a graphene material resistant to high temperature and extreme cold.

This material can maintain good stability and high elasticity in the deep low temperature range of minus 260 degrees to the high temperature range of [-] degrees.

Prior to this, the elastic and mechanical properties of all highly elastic materials were affected by temperature, so they could not maintain excellent performance under extreme conditions such as outer space.The "extremely cold graphene material" developed by Professor Chen Yongsheng just solved this pain point and filled a vacancy in the field of engineering application.

However.…

Extremely cold materials, although useful, belong to a relatively small field.

Even if he spends half his life researching,

At the age of more than 70 years, the creation of "extremely cold graphene material" is nothing more than a little reputation in the circle...

There are too few places where extremely cold materials can be used!

"This extremely cold material consists of disordered single-layer graphene sheets, chemically cross-linked by covalent bonds. I have tested it at extremely low temperatures down to the temperature of liquid nitrogen.

This material still has the same mechanical properties as at room temperature at minus 260 nine degrees, including highly recoverable superelasticity, constant elastic modulus, nearly zero Poisson's ratio, and excellent fatigue resistance

He introduced the masterpiece he was most proud of in his life to his doctoral students,

It's just... no one else can appreciate the romance and beauty of this material!

Just when Chen Yongsheng was sad, the heavy door of the laboratory was pushed open.

A beam of light came in from outside the door, and two soldiers stood straight at the door, saluting Chen Yongsheng.

"Professor Chen, you have been recruited by the state!

Chapter 43 Unprecedented design in the world!

Chen Yongsheng stared blankly at the two soldiers at the door, that beam of light...is the light that is willing to serve the country with this body...

"The country... the country conscripted me?!"

His lips trembled, and on his old face, there was confusion and suppressed excitement.

Two soldiers took out a red-headed document and said solemnly: "Yes, Professor Chen Yongsheng, please come with us!"

Chen Yongsheng staggered a bit, let his doctoral student help him and walked over,

He adjusted his glasses with difficulty, and read the red-headed document against the light over and over again.

This unknown old man, who has studied in the field of material mechanics for more than [-] years and devoted his whole life to the development of extremely cold materials, is crying at this moment.

He straightened his waist vigorously, and told his doctoral student:

"Your doctoral dissertation is wonderfully written, and I have already read it ahead of time. Don't worry about graduation. After graduation, you can continue to study the research of extremely cold materials, or start your own new path." Finally, help me and your teacher's wife , my son, and the unit where I work report a letter saying that I, Lao Chen, have gone to serve the country! "

After finishing speaking, Chen Yongsheng strutted up to the side of the two soldiers and said, "You two comrades, let's go!"

Du Niang, mechanics of materials.

The always deserted Mechanics of Materials, since this morning, the number of active people has suddenly increased dramatically. In just a few hours, the number of new posts has reached [-]! !

[Beginner Level 1-Magic City Wang Yufei]: "I received news that the country is developing a batch of new materials. Does the buddy from the Material Mechanics Bar know the details?"

[Senior enthusiast level 6. Shancheng Wang Dezhu]: "Several people from the research institute I work in have been called over. They are all researching extremely cold materials. If I guessed correctly, what the country needs is related to cold resistance. Engineering Materials!"

[Small bar owner. Tiandu Peng Huakui]: "In my construction company, several colleagues from the research and development department have also been transferred by the state. They are researching cold-resistant building materials! In the past, these people were specially designed for high-latitude regions. building materials!"

[Materials expert level 12. Lin Bin, Zhejiang Province]: "I am engaged in alloy steel, especially alloy steel below zero degrees Celsius. Today, the country ordered a batch of steel from me!!"

"What are you going to do?"

"It's all about cold resistance. The weather is getting hotter and hotter. Why use so many cold-resistant materials!"

"Isn't the country going to build an underground city? Isn't the underground temperature very low?"

"That's impossible! No matter how low the underground temperature is, it's actually just a suitable temperature. It's better than the land. It's warm in winter and cool in summer. The temperature of more than 100 meters below is constant at about [-] degrees Celsius. It's very comfortable."

"Is it to use these materials to explore the North and South Poles?"

Qinghua Garden, Dangerous Information Bureau Building.

Xu Qiu is currently deploying plans for the preparation, transportation, and transformation of various materials.

"We need ultra-low temperature steel!" He said with sharp eyes.

Zou Botao raised his head from the pile of documents, and his callused hands flipped through the [-]-page super dungeon construction plan.

"Well, this dungeon requires a lot of steel. If it wants to withstand the extreme low temperature after the sun goes out, this steel must be redesigned..."

Xu Qiu nodded, and he called up the steel structure design CAD construction drawing, taking into account the structure's self-weight, display load, maintenance load, wind load, structure heating and cooling, and earthquake effects, etc. The top priority!

"There are almost no precedents for the design of these steel materials!"

Xu Qiu frowned, with far-reaching eyes, and said: "In the past, the building structure was built from the ground up. But our dungeon is built from the ground level to the depths of the earth's core!"

This is an unprecedented design!

"Our ultra-low temperature steel must meet several conditions!"

Zou Botao took out a piece of paper, prepared to record Xu Qiu's words, and said, "Director Xu, please tell me!"

"The first is toughness. Generally speaking, steel with good toughness at room temperature will undergo a huge change in brittleness at low temperatures. Many steels, which can be used in the south, are as brittle as glass in the north!"

"Not to mention the ultra-low temperature of minus two hundred degrees after the sun goes out!"

The atomic arrangement structure of steel appeared in Xu Qiu's mind.

The toughness of a material refers to its ability to absorb impact energy through plastic deformation.

And this energy is approximately equal to the force multiplied by the deformation distance.

On a microscopic scale, the sliding of bulk atoms is quite difficult, but with the help of a crystal defect called "dislocation", the overall deformation can be realized step by step through local sliding!

In other words, the toughness of the material depends on the ease of sliding of "dislocations". The easier it is for "dislocations" to occur, the higher the toughness.

And this kind of "dislocation" is also called edge dislocation, because the extra half row of atoms in the core area looks like a knife edge, which is cut into the material!

The question, then, becomes... how to make it less difficult for steel to be "dislocated"? .

Chapter 44 Austenitic steel, an excellent material for dungeons!

Xu Qiu's brain was spinning rapidly.

Can the commonly used ferritic steel be replaced by austenitic steel?

His eyes lit up.

In ferritic steels, the iron atoms in the microstructure are arranged in a body-centered structure, while in austenitic steels it is a face-centered structure.

The metal dislocation of the body-centered structure is quite special, because in the close-packed direction of the metal of the body-centered structure, the atoms themselves are also arranged in a helical shape.

Therefore, when the steel of this structure is dislocated, either the two spirals add together, or they cancel each other out, which also brings about two different energy states!

The result of this is that when the "dislocation" tries to slide, the position with high energy becomes an obstacle to sliding, making it difficult for this type of dislocation to start, and it is more difficult for the "dislocation" to occur! And the face-centered structure Austenitic steel has no such characteristics at all, and can maintain high enough toughness at low temperatures!

Thinking of this, Xu Qiu realized, he said: "Just choose austenitic steel!"

Austenitic steel has high low temperature toughness, generally no toughness. Brittle transition temperature!