The Literary Life of a Science Leader

Chapter 156 Superalloy research at home and abroad
"You can only go on like this, take your time!"

Hao Chen also followed Mu Jingchi's thoughts and sighed, "Let's see if these outstanding people can find a feasible route!"

"Director Hao, our country should not be short of materials for aircraft engines, right?"

Seeing Hao Chen's gloomy expression, Mu Jingchi expressed his doubts, "Is there any need to be so anxious?"

It is normal and reasonable to attach importance to material research and development.But in Mu Jingchi's view, there should not be such worries about aero-engine materials, because the country is still capable in this regard.

In the field of casting high-temperature alloys, the performance of Huaxia's third-generation single-crystal alloys has been comparable to that of foreign countries, and prototypes of blades with complex structures have also been trial-produced.For example, Wanze has established relevant R&D and engineering centers in Shenzhen and Changsha respectively. It has mastered the advanced technology of high-temperature master metal and blade manufacturing, and successfully prepared samples such as precision casting blades, forged equiaxed wafers, and powder turbine disks.

In the field of powder superalloys, Huaxia's FGH96 alloy baffles and FGH97 alloy discs have been applied to certain models of engines.

"What you know is only one aspect. Overall, we are still behind." Hao Chen understood Mu Jingchi's thoughts.

After all, Mu Jingchi was promoted too quickly. There was only half a year between his bachelor's degree and his doctoral degree. During this half-year, he had been obsessed with materials research.

Indeed, very little is known about the global superalloy field.

After all, Mu Jingchi's research direction is not here.

"In the field of high-temperature alloys, the United States is in an absolutely dominant position. Under such conditions, the government is also actively providing scientific research funds to support research and development in the field of high-temperature alloys."

"In the field of high-performance materials, researchers at Michigan Technological University will develop physics-based creep models for nickel-based superalloys, which are said to have achieved some results; Ohio State University will develop new modeling capabilities to predict advanced supercritical steam turbines Long-term creep behavior of nickel-based superalloys."

"NASA's Marshall Space Flight Center has developed a dispersion-strengthened molybdenum-rhenium alloy, and vacuum plasma spraying is used to manufacture high-temperature resistant components, and results have also appeared."

"There is also the Idaho National Laboratory to analyze how precipitates form in superalloys, and to study how they can improve the heat resistance of the alloys. By adjusting the heat treatment process, the size of the precipitates becomes larger so that the matrix can resist extreme heating conditions."

"And Japan is in a dominant position in nickel-based single crystal superalloys, nickel-based superplastic superalloys and oxide grain dispersion strengthened superalloys."

“A research team composed of Professors Yoshisuke Yoshitoshi and Yu Sato of Tohoku University in Japan have developed a MoSiBTiC alloy that can withstand ultra-high temperatures and ultra-high pressures. It is a titanium carbide-reinforced molybdenum silicon boron-based alloy with strong toughness. High-temperature alloys have successfully tested their high-temperature properties in the temperature range of 14000-1600.”

"Associate Professor Ogihara Koji of Osaka University and Nakano Takada's research team composed of scaffolding and others have developed a high-temperature resistant turbine blade material above 1400 degrees. The research is to add 0.05% mole fraction of chromium and iridium to the silicide multiphase alloy. From From the perspective of material mechanical properties, compared with conventional silicide multi-phase alloys, it is found for the first time that the material can also suppress the problems of low strength and toughness in specific directions on the basis of maintaining its excellent mechanical properties."

Listening to the series of foreign achievements that director Hao said, Mu Jingchi felt deep pressure. These research results can be said to be very excellent results, and have a very wide range of application directions.

"What about our country?"

Mu Jingchi didn't believe that when developing abroad, the country was stagnating, so he asked.

After listening to Mu Jingchi's words, director Hao also adjusted from the slightly heavy tone just now, and said with a smile: "Of course we have achieved a lot."

Hao Chen didn't think about it, and just threw out the words.

"Based on the formation mechanism of solidification defects of single crystal blades, the Institute of Metal Research of Huaxia Academy of Sciences proposed a number of effective solidification defect control measures in engineering, formed a set of full-process control technology for large-scale manufacturing of single crystal blades, and successfully developed multiple Different types of single crystal blades have greatly improved the pass rate of multiple single crystal blades, and now continue to dig deeper.”

"There is also the high-temperature alloy blade rolling blank-cold roll forming developed in cooperation with the Belarusian Academy of Sciences. The advanced technology of recovering metal rhenium in superalloys is of great significance in the reuse of rhenium and the development of superalloys in our country."

Speaking of this, Hao Chen glanced at Mu Jingchi.

"Also from your school, Huaqing University, China Aviation Development Yanjing Aeronautical Materials Research Institute, and China Aviation Development Shenyang Liming Aviation Engine Co., Ltd. jointly completed the 'Multi-scale modeling and simulation technology of directional solidification of high-temperature alloy blades for aerospace engines and Engineering Applications' project."

"You should know that, right?"

Mu Jingchi nodded, "I heard something."

"This project carried out macro-microcosmic multi-scale coupling modeling on the directional solidification process of single crystal superalloy turbine blades, which can not only simulate the macroscopic temperature field, solute field, but also simulate the growth of dendrites. This achievement has been successfully applied to turbine blades It is the first domestic software used in the development of domestic aero-engine single crystal/orientated columnar crystal turbine blades."

"There's one more about you."

"It's related to me?" Mu Jingchi was very curious, "How to say?"

"The team of academician Zhang Ze of Zhejiang University found that the best addition position of noble metal rhenium in superalloys is the dislocation core of the interfacial dislocation network. At this key position, rhenium can play a special role by strengthening the interface strength to make the material Not easy to break."

"Then, your theory of dislocations emerges."

When it came to the part about Mu Jingchi, Hao Chen not only changed his tone, but also had a smile on his face.

"Although the gap between us and foreign countries in high-temperature alloys is relatively large, fortunately you stepped forward. The dislocation theory system targets all crystal materials, which gives us the opportunity to overtake in corners."

Mu Jingchi smiled without showing any humility.

"Then I will continue to work hard and strive to complete the construction of the entire dislocation theory system!"

For him now, humility is also a kind of pride in the eyes of others, so there is no need to pursue modesty too much.His age is Zhang Yang's age, and he has really made practical results.

It is not the kind of results that cannot be seen in practical applications for the time being. Aluminum alloys have been used in the global material market, and the dislocation theory, which is currently being studied, can also be used in material forming technology.

(End of this chapter)