Chen Yongsheng stared blankly at the two soldiers at the door. Man, that beam of light…is the light that is willing to receive this body to serve the country…
" The country…the country wants to recruit me?!"
His lips trembled, and his face, which had already revealed his old age, was filled with confusion and suppressed excitement.
Two soldiers. The man took out a red-headed document and said solemnly,"Yes, Professor Chen Yongsheng, please come with us!”
Chen Yongsheng staggered a bit and asked his PhD student to help him walk over,
He adjusted his glasses with great effort and read the red-headed document again and again under the light.
This old man, who had been studying materials mechanics for more than 50 years and spent his whole life on the development of extreme cold materials, was crying at this moment.
He straightened his back and said to his PhD student,
"Your PhD thesis is very interesting. I've already read it in advance. There was no need to worry about graduation. After you graduate, you can continue to study extremely cold materials, or walk your own path…"
"Lastly, help me, your master's wife, my son, and the unit I work at to tell them that I, Old Chen, am going to serve the country!”
After saying that, Chen Yongsheng walked up to the two soldiers with his head held high. "Comrades, let's go!"”
……
……
Du Niang, material mechanics.
The material mechanics forum, which had always been deserted, had a sudden increase in active users since this morning. In just a few hours, the number of new posts had reached 2,000!!
Beginner Level 1-Shanghai Wang Yufei: "I received news that the country is developing a new batch of materials. Do you guys at the Materials Mechanics Bar know the details?”
Senior Enthusiast Level 6-Mountain City Wang Dezhu: "A few people from my research institute have been called over. They are all researching extremely cold materials. If I'm not wrong, the country needs engineering materials related to cold resistance!”
The owner of the small bar, Peng Huakui, said," A few colleagues from the research and development department of the construction company I work for have also been transferred away by the country. They are researching cold-resistant construction materials! In the past, these people had specially designed construction materials for high latitude regions!”
Material Specialist Level 12-Zhejiang Province Lin Bin: "I'm in alloy steel, especially alloy steel below zero degrees Celsius. Today, the country ordered a batch of steel from me!!”
"What are you doing?"
"It's all related to cold resistance. The weather is getting hotter and hotter. Why are you using so many cold-resistant materials?”
"Isn't the country building an underground city? Is the underground temperature very low?”
"That's impossible! No matter how low the underground temperature was, it was only an appropriate temperature. It was better than the land. It was warm in winter and cool in summer. The temperature was constant for more than 100 meters underground, maintained at around 15 degrees Celsius. It was very comfortable!”
"Are we going to use these materials to explore the North and South Poles?”
……
Qinghua Garden, Danger Bureau building.
Xu Qiu was making arrangements for the preparation, transportation, and modification of various materials.
"We need ultra-low temperature steel!" His gaze was sharp as he spoke.
Zou Botao lifted his head from the pile of documents. His calloused hands flipped open the hundred-page Super Dungeon construction plan.
" Yes, this underground city requires a large amount of steel. To withstand the extreme low temperature after the sun goes out, this steel must be re-designed…"
Xu Qiu nodded. He pulled out the steel structure design and construction drawings. He took into account the weight of the structure, the load on the display screen, the maintenance load, the wind load, the temperature rise and drop of the structure, the earthquake effect, and so on. As for the cold resistance, it was the top priority!
"There are almost no precedents for the design of these steel materials!”
Xu Qiu frowned and said,""In the past, the structure of buildings was built from the ground up. However, our underground city is built from the surface to the core!”
This was an unprecedented design!
"Our ultra-low temperature steel must meet a few conditions!”
Botao took out a piece of paper and prepared to record Xu Qiu's words."Chief Xu, please go ahead!"
"The first is tenacity. Generally speaking, steel with good toughness at room temperature would undergo a great change in brittleness at low temperatures. A lot of steel could be used in the south, but in the north, it would be as brittle as glass!”
" Not to mention that it's an ultra-low temperature of-200 degrees after the sun goes out!”
The atomic structure of steel appeared in Xu Qiu's mind.
The toughness of a material referred to its ability to absorb impact energy through plastic transformation.
And this energy was approximately equal to the force multiplied by the distance of the transformation.
On a microscopic scale, the sliding of large atoms was quite difficult. However, with the help of a crystal defect called 'dislocations', it was possible to achieve the overall transformation step by step through local sliding!
In other words, the toughness of a material depended on how difficult it was for the " dislocations " to slide. The easier it was for the " dislocations " to occur, the higher the toughness.
This kind of " dislocations " was also known as edge dislocations because the extra half of the atoms in the core region looked like a blade. It entered the materials!
Then, the problem became…how to reduce the difficulty of the steel's 'dislocation'?
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