It was past nine o'clock that night. Zhao Jingfu was looking through the reference books with various experimental names and wondering what the data represented. Suddenly he heard someone shouting outside the window.
Then there was a burst of joyful shouts.
Zhao Jingfu looked through the window and saw several people cheering in the experimental workshop not far away, and then saw Han Fangyun hurriedly coming with a few people.
Zhao Jingfu also hurriedly put on a piece of clothing and went out of the room. The orange streetlights stretched everyone's figures. In the experimental workshop, which was as bright as day, several young engineers were comparing data.
"Teacher Han, the low surface toughness of f690 is a unique surface effect of extra-thick steel plates!" an engineer pointed at the data curve on the screen and said, "It should be that the excessive cooling rate on the surface of the extra-thick plates causes the surface area to shrink.
The deformation nucleation rate of the martensitic phase decreases, resulting in the relative coarsening of the surface martensite lath bundles and lath blocks and a high density of alignment dislocations, thus triggering the surface effect of the extra-thick steel plate!"
Han Fangyun nodded slightly, "You're right, it should be this reason. Now that the reason has been found, we have to take remedial measures. The as-cast structure of the alloy steel we designed is pearlite. The tensile strength at room temperature, yield
The strength has been able to meet the strength requirements, then we can consider using other methods to affect the quantity, shape and austenite grain size of lath martensite inside the alloy steel!"
"Teacher Han, do you mean we can take process remedial measures?" As the director of the Iron and Steel Research Institute, Han Fangyun is also responsible for the training of this group of young engineers. Everyone generally likes to call her teacher.
Inspired by the teacher, the engineers suddenly realized that experience is the most important thing when encountering this kind of thing.
"Yes, austenitizing temperature and holding time can affect the internal changes of alloy steel. What we need to do next is to adjust the quenching process time and temperature little by little, and find the balance point little by little!"
Engineers who had received new revelations once again entered into the repeated process of smelting, forging, and quenching. Fires were everywhere in the laboratory. Pieces of alloy steel were constantly immersed and taken out from the oil fire. The flames were like fire dragons.
Refining the growth of f690.
Zhao Jingfu had never seen that the development of a steel plate required such a difficult process. He originally thought that his welding work was hard enough, but he did not expect that metallurgical materials experts would also need to suffer in oil fires.
More importantly, every new steel plate needs to go through a series of data tests, and then make mistakes little by little and change the next process measures.
Even though there are many precautions in place and engineers strictly follow the experimental procedures, accidents still happen frequently. The steel slag debris that bursts out is enough to burn through unprotected clothes. The protective gloves of engineers are often blackened.
Each one is like a god in the fire, creating materials that are unique in the world.
In the repeated failures, pieces of steel plates were abandoned in the corner. These are the ladders to success, but no one knows what is at the end of this ladder. They only have one goal.
That is to be able to forge the most ideal alloy materials to meet the design requirements and help the Blue Whale grow smoothly.
As time went by, dozens of days passed, and the engineers repeated almost the same work every day. Zhao Jingfu saw countless discarded steel plates abandoned in the corner, and the countdown signs constantly displayed on the wall made him anxious.
Due to the operating rules of the laboratory, Zhao Jingfu could not help even if he had the ability. He could only watch these young engineers looking for a path to success in the flames. Only occasionally when manpower was needed, he would step forward to help lift.
Carrying an experimental sample weighing several hundred kilograms.
"It's not easy!" Zhao Jingfu stood in front of the observation window of the laboratory and sighed sincerely.
"It's really not easy!" Han Fangyun's hoarse voice sounded behind him.
Zhao Jingfu quickly turned around and said, "Director Han, are you here again?"
Han Fangyun lived in the research institute like him, and she could be seen busy in the laboratory almost every day, even carrying heavy experimental boards like those young men.
"Yes, I'm not worried. Yesterday's experimental data has come out. I took a look and found that there is still a certain gap between our final goal, but it is much better than the initial situation!"
Only then did Zhao Jingfu see Han Fangyun holding a thick stack of experimental data reports in her hands. Judging from her red eyes and tired look, he probably had studied all the data carefully overnight.
"It's good if there is progress, but I'm afraid that more and more problems will arise, which will be bad!" Zhao Jingfu said with a smile.
"Yes, as long as there is progress, it means that we are in the right direction. We just need to strengthen the experiment according to this progress. I'm afraid..." Before Han Fangyun could finish speaking, he heard a dull sound.
There was a cloud of smoke coming out from the laboratory.
When the two saw this, they rushed over. The engineers were already smoked out by the thick smoke and the smoke from the fire extinguisher.
"What happened?" Han Fangyun asked anxiously.
"Teacher Han, maybe the temperature has not been adjusted properly. There is a small problem over there! It has been taken care of, but the smoke is a bit loud!"
The high-power fan immediately started running, and the laboratory soon became much clearer. Han Fangyun checked carefully and found that there were no problems with the personnel and equipment, so she felt relieved.
"We must continue in accordance with the experimental operating rules, and we must not cause experimental accidents just to keep up with the schedule!" Han Fangyun warned.
"No problem, but this smoke can help us get rid of mosquitoes!" the engineers said with a smile, pointing to the mosquitoes flying on the grass around the laboratory.
"There are many ways to smoke mosquitoes, so don't cause problems again! We have seen the light of day!" Han Fangyun encouraged everyone.
In the continuous experiments day and night, Han Fangyun led the engineers of Hong'an Rigid Body to repeat the process of smelting, forging, and quenching over and over again, constantly changing the process data, and beating the pieces of fiery red steel plates to make them extremely tough.
"Teacher Han, look at this data result!" Another experimental steel plate came out, and under the test of various stress analysis instruments, data were displayed one by one.
"Master Zhao, come and see!" Han Fangyun pointed to the data record table in front of him and said to Zhao Jingfu, "After quenching this experimental plate at 850 degrees Celsius for thirty minutes, the number of martensite is the largest, the laths are uniform and small, and the cast alloy
The hardness of steel is hrc48.3, the austenitized grain size of forged alloy steel is 10.1, and the hardness can reach hrc47.1! Let’s take a look at the tensile and yield strength!”
Soon, although the tensile strength and yield strength of alloy steel using the forging process are slightly lower than that of cast alloy steel, the impact toughness has been greatly improved, and it has the best comprehensive mechanical properties and electrochemical properties.
Moreover, in low-temperature experiments, even at a temperature of minus 40 degrees, the tensile strength and yield strength reached 806 MPa, but the impact toughness did not decrease significantly, and it has good low-temperature tensile and impact properties.
This means that this piece of alloy steel with a thickness of more than 100 mm has the huge strength that the Blue Whale needs to withstand.