Master descends to earth

Chapter 49 44 Returns 1

Chapter 49
The reason why the quenching process is complicated is that in order to obtain martensite in the process, the cooling rate must be greater than the critical cooling rate, and rapid cooling will inevitably cause a large internal stress, which often causes deformation or cracking of the cutter body, or makes the toughness of the cutter Reduced, the cutting edge is prone to cracking during use.

If the cooling rate is less than the critical rate, no horse body will be obtained after quenching, and the hardness, wear resistance and sharpness of the blade will be insufficient.

Therefore, the cooling rate must be just right, not only to ensure martensite, but also to reduce deformation, prevent cracking, and maintain toughness. This is the most important problem in the quenching process.

Su Yuan stared at the meteorite, and saw that the original dim golden light gradually recovered with each blow, and even became more intense, as if it had undergone rebirth, after tempering, it broke out of its cocoon and became a butterfly.

"Turn back!"

Su Yuan put the meteorite into the stove again, and ordered Yagyu Emi to reduce the wind speed, so that the meteorite gradually heated up and regained its strength.

Emi Yagyu stared at the stove. Quenching and tempering are closely related, and they are often used in conjunction with each other.After strong forging, a special quenching agent is used for softening treatment, so that the sword body can be both rigid and flexible, and can be bent and stretched.It is a high-precision craftsmanship, which is not handy for ordinary craftsmen.

"Prepare for oil quenching!"

Xu Kui quickly put down the hammer, picked up a wooden stick, and vigorously stirred the beef and mutton oil and yellow mud in the cauldron to fully blend the two. This is the long-lost secret recipe for oil quenching.

Su Yuan looked at the meteorite iron that was slowly recovering its vitality. In fact, the theoretically ideal quenching and cooling speed of steel is: the cooling process from slow above 650 degrees to fast 650-500 degrees and then slow to below 300 degrees.

But meteorites are different. After all, they are visitors from outside the sky. After high-speed friction with the atmosphere, the temperature may reach several thousand degrees. Therefore, the greater the temperature difference, the more potential it can stimulate and the limit will be increased.

"Step aside!"

Su Yuan quickly picked up the meteorite, walked to the cauldron in a few steps, asked Xu Kui to get out of the way, and directly inserted the red sword embryo into the oil pan, and instantly there was light smoke and a scent of oil.

"Water hit!"

"Both sides of the blade!"

It was another round of beating, and the two cooperated more tacitly and had a stronger sense of rhythm. After all, Xu Kui was a master, so he quickly adapted to Su Yuan and found his own feeling.

In industry, it is usually a quenching agent made of an aqueous solution of salt, alkali, water glass, polyvinyl alcohol, zinc chloride-alkali, etc.Although these quenching agents can meet the requirements of ordinary quenching processes, they have strong corrosiveness and are not easy to clean.

Su Yuan looked at the more and more intense golden light, the sword embryo had been quenched with oil, as if after taking Shiquan Dabu pills, it was instantly full of vigor and grace.I felt relieved, it seemed that my analysis was not wrong, as expected.

There are two advantages of oil quenching: first, the sword embryo is slowly cooled in the air, and then quenched in mud water. When it reaches the low temperature zone, the yellow mud condenses on the surface of the knife, hindering the contact of oil, and reducing the cooling rate in the low temperature zone.

The second is that the yellow mud is rich in various trace elements, which are tonics for swords. They can be fully absorbed in the two worlds of ice and fire, improving quality, increasing strength and toughness.

It's like a person practicing martial arts, not only practicing hard day and night, but also supplementing with diet, so that the progress can be made by leaps and bounds, and the skill is improved by leaps and bounds.

"Rainbow!" Liu Sheng Huimei stared at the sword embryo in the oil, suddenly became excited, and exclaimed: "It's actually a rainbow!"

Xu Kui also showed shock on his face, and he watched Su Yuan quickly lift the sword embryo out of the oil, and a rainbow appeared at the boundary line between the cold and hot areas of the sword body at this time!
under the moonlight,

colorful,

A flash of inspiration,
Extremely miraculous!

Su Yuan focused his attention on the blade, and under the effect of the remaining temperature, the rainbow quickly moved towards the blade. When the rainbow was close to the edge, it was quickly immersed in the oil again, and then lifted up quickly. Repeated three times, the rainbow finally disappeared.

"Awesome, really fucking awesome!"

Xu Kui couldn't help but swear directly, seeing the rainbow just disappearing on the tip of the sword, he said excitedly: "Seven colors suddenly appear, three in one!"

Putong knelt down, kowtowed three times to Su Yuan, and said loudly: "It really is the method of oil quenching, thank you, master, thank you, master!"

"This is the legendary oil quenching ancient method?"

Huimei Liusheng looked at Su Yuan in a daze, and suddenly came back to her senses, quickly knelt down and said respectfully: "The master really deserves his reputation, such a unique skill makes Huimei astonished as a celestial being, and she throws herself into the ground."

Su Yuan was taken aback, looking at Xu Kui who was kneeling on the ground, he couldn't laugh or cry, and scolded: "Now is not the time to kowtow, hurry up and continue beating!"

After hearing this, the big fool also knew that he was too excited, so he stood up quickly, and his tired body instantly felt as if he had been beaten with chicken blood.

"Don't just stand there, increase the wind and add more charcoal."

Liu Sheng Huimei blushed, and ran to pick up the pine charcoal and put it into the stove. Su Yuan put the sword embryo into the fire, and the fire burst into flames in an instant, and he breathed a sigh of relief.

"Double Quenching has finally been completed!"

Suddenly my mouth was dry, I drank two bowls of water in a row, looked at the dazzling golden light in the fire, and completely completed the first round of folding, four times of forging, four fires, three oils and one water, four fours into one.

"Rest quickly, the second round will start in 10 minutes!"

Seeing Xu Kui excited like an animal, Su Yuan scolded with a smile: "It's too early to get excited, it won't be too late to wait until the sword embryo comes out!"

"The method of oil quenching... the rainbow... I finally saw it with my own eyes!" Xu Kui kept muttering to himself, and when he heard Su Yuan's words, he suddenly came back to his senses, slapped his chest hard, and laughed loudly: "It's okay, I can see you." It's worth dying until oil quenching!"

Su Yuan threw the towel over, the stupid big one is a treasure, such a strong animal is rare in a hundred years, where can I find another one when I am exhausted?
"continue!"

Twenty or 10 minutes later, the continuous sound of hammering iron was heard in the workshop, spreading throughout the streets and alleys of Longquan. Not only them, many people like to work late at night, this is the charm of Longquan!
Fighting again, flowing water,

cold spring quenching,

Three oil quenching,

tempering, annealing,
Two heavens of ice and fire,
Every time the sword embryo is like going through the cycle of life and death,

Breaking and standing again and again,
Nirvana rebirth,

After Sansei III,
break out of the cocoon and become a butterfly,

The three-foot green front is complete!
(End of this chapter)

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