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Chapter 44 The first steel plate

Zhao Jingfu moved from the hotel to the Iron and Steel Research Institute and set up camp in an empty room in the laboratory.

As Han Fangyun said, the environment here is indeed not very good. There is only a wooden bed, a table, simple bedding and a mosquito net in the empty room. The institute is in the suburbs, and there are a lot of mosquitoes here.

.

Fortunately, Zhao Jingfu is not a spoiled person. As he said, when he was working in a shipyard to meet deadlines, he had been in conditions worse than this.

Hong'an Steel moved quickly. After the agreement was signed, a marine steel research and development project team headed by Director Han Fangyun was immediately established to conduct scientific research on the 100 mm thick ultra-high strength marine engineering steel F690.

Although Hong'an Steel has strong scientific research capabilities in special steel, due to the particularity of the marine environment, marine engineering steel basically has good low-temperature performance and corrosion resistance, especially fatigue and structural properties.

Special requirements have made it a highly technological variety in the steel industry. These high-performance castings and forgings were almost entirely imported before, and domestic research on this was relatively weak.

Especially this time, due to the construction period of the Blue Whale, the research and development time is very strict, which forces the institute to change the previous scientific research methods and adopt the latest testing and forging optimization mechanisms to carry out the research and development of f690 ultra-thick marine plates.

R&D work.

Han Fangyun required that the laboratory of the Iron and Steel Research Institute be open to the f690 project team around the clock. The project team can use the laboratory's various facilities at any time, and the logistics support personnel must also be on duty 24 hours a day to ensure the living needs of the research project team.

The project team first sorted out Hong'an Steel's past R&D data and the latest international and domestic industry trends, and based on the structure, mechanical properties, corrosion resistance and low-temperature properties of alloy steel, it adopted the principle of multiple and small-scale composite strengthening, and immediately

The elemental design of f690, a new type of ultra-high-strength alloy steel for marine engineering, began.

Regarding these design principles, Zhao Jingfu is basically a layman. He only briefly understood some knowledge in this area through the reference books given to him by Wei Yuhui. When talking to the R&D personnel, he did not understand everything. What he wants now

What we do is, after the finished product of F690 comes out, welding inspection is carried out on it, and then the inspection structure is fed back to the R&D personnel to adjust the alloy elements. The specific adjustment data is the secret of Hong'an Steel.

Watching these scientific researchers constantly adjusting various data, forging pieces of steel billet, some are red, some are blue, and some are black, all kinds of sparks are colorful, looking at them from a distance, they are like streaks

Magnificent fireworks.

This reminded Zhao Jingfu of the moment when he embarked on the road of welding, and there was a bright spark that fascinated him.

In this way, during the day and night experiments at the institute, the first f690 was finally born.

Zhao Jingfu had just gotten up and was brushing his teeth with a teacup in his hand when he heard a knock on the door.

"Master Zhao, Master Zhao! Come out! Come out!" Someone shouted outside the door.

"What came out?" Zhao Jingfu opened the door and asked strangely.

"The first piece of F690, Director Han asked me to come over and tell you!" The person who ran over to report the news was a young college student from the project team. It was a very rare opportunity for someone to participate in such a project just after graduation.

When Zhao Jingfu heard this, he didn't care much. He wiped his mouth randomly and rushed out.

In the forging laboratory, a square experimental steel plate measuring fifty centimeters by fifty centimeters lay quietly on the table, with some reddish-brown ash on the surface, which was the trace of forging that had not yet been wiped away.

"Is this a matrix structure dominated by tempered martensite obtained after quenching and tempering treatment?" Zhao Jingfu is now learning and selling.

Han Fangyun looked at Zhao Jingfu in surprise. She knew that Zhao Jingfu was a master in welding, but she didn't expect that he also knew a lot about forging!

"That's right, the basic structure we obtained after tempering and quenching treatment has laths containing high-density dislocations and tiny carbides, which has excellent strength and toughness matching! This is our first finished product.

Next, we will use optical metallographic microscopes, scanning electron microscopes, hardness testers, tensile testing machines, impact testing machines and electrochemical workstations to conduct a series of tests on the structure, mechanical properties and corrosion resistance of alloy steel.

, and compare the effects of heat treatment on the cast and forged states to optimize the heat treatment process!"

Zhao Jingfu looked at this piece of steel plate that didn't look special with some curiosity. Apart from a slight increase in thickness, there seemed to be nothing strange about it. However, the more unremarkable the thing, the more different its inner texture was.

"The main reason I am so anxious to bring you here is to witness the low-temperature impact toughness test of the first piece of F690!" Han Fangyun said with a smile.

The low-temperature toughness impact test is important data for ultra-high-strength marine steel plates. Theoretically, due to the influence of the thickness effect, during the quenching process of extra-thick marine steel, the surface cooling rate of the steel plate is the largest, and a more uniform tempered Martens can be obtained.

The body tissue should have excellent low temperature impact toughness.

This was also the experiment first proposed by Han Fangyun. After all, everyone wants to get off to a good start.

The experiment started soon. All the R&D personnel present had a smile on their faces, thinking that this was a test without any suspense. Zhao Jingfu also looked at the experimental data on the screen seriously. After this period of hard work, he

You can also memorize some key data backwards and forwards.

Time passed little by little, and as the temperature of the experiment dropped, Han Fangyun's expression seemed to be a little off. Zhao Jingfu also frowned at the changing data. It seemed that the expected value had never been reached and was always at a lower value.

Wander.

Han Fangyun couldn't sit still. She kept using the walkie-talkie to communicate with the experimenters in front of her, and used various methods to conduct tests. The results were still unsatisfactory. The first F690 extra-thick and ultra-high-strength marine panel that had just been completed did not complete the low-temperature process.

In the impact toughness test, the surface impact toughness was even lower than nearly 30%, which is an unacceptable result!

"The research and development of new materials cannot be accomplished overnight. We need to find the crux of the problem before we can target it!" Although he failed in front of the guests, Han Fangyun did not blame everyone, but constantly encouraged them.

Zhao Jingfu didn't say anything. He didn't know what to say. He just watched with admiration as these scientific and technical personnel once again engaged in busy experiments and tests. They wanted to immediately find out the reason for the test failure, and then based on the reasons

Make adjustments.

This chapter has been completed!
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