Chapter 997 Prepared a bunch of

"Well, you have a point. Even if there is no other improvement in weight, it is worth it just to solve the surge problem!" Both Mr. Wang and the Air Force are willing to pay this little price to improve the safety of the aircraft to a higher level.

Moreover, he had the huge thrust bonus brought by the changed materials in his hands, so he didn't care about this little weight at all. In any case, the weight of the two-stage blades of the high-pressure compressor could not completely offset the thrust increase brought by the change of materials to increase the temperature before the turbine.

Gao Zhendong nodded: "Yes, besides, we are not completely without countermeasures for this. We can replace part of the material of R-11 and reduce the weight!"

Changing materials? Mr. Wang was no longer sleepy after hearing this. Chief Engineer Gao said that changing materials was different from other people's changing materials. When other people changed materials, they had to find a way to find the materials, otherwise they couldn't change them. It was like if LYP-6 didn't have 591 alloy, they were almost helpless and could only ask for help from the th Ministry of Machinery.

But when Chief Engineer Gao said to change the materials, it proved one thing - he probably had an idea about these materials.

A comprehensive expert spanning multiple disciplines is so arrogant.

"What do you want to change? What kind do you want to change?" Mr. Wang was very straightforward and went straight to the point.

"We will change the material to titanium alloy! We will replace the cold end and other non-high-temperature locations with titanium alloy as much as possible! In addition, we can also replace some nickel-based castings to reduce the weight as much as possible!"

The specific gravity of titanium is 4.5, which is much better than iron's 7.8. The weight of titanium alloy is not much heavier either. Moreover, the advantage of titanium alloy is its high specific strength, which is much higher than that of steel.

This means that under the same mechanical properties requirements, titanium alloy is much lighter than various alloy steels. This is not the case with aluminum, which is also famous for its lightness. Its specific strength is poor. If you want to achieve the same strength, it is better to use steel after comprehensive consideration.

However, the high-temperature performance of titanium alloy is not as good as that of high-temperature alloy. In this regard, we still have to rely on 591 high-temperature alloy.

The amount of titanium alloy used in R-11 is not high, and Gao Zhendong happened to know what LYP-13 used in its core components.

"Such a big move?" Mr. Wang was a little confused.

"Just give it a try, hahaha. This is what I'm thinking..."

Gao Zhendong drew a rough structure of an engine on the blackboard, and the structure was basically the same as the one he was going to improve.

He looked at the structural diagram and clearly marked the materials used in every key component, from the air intake to the combustion chamber, high- and low-pressure turbines, and afterburner. He even went into detail, including the compressor shaft, blades at each stage, disks, rotors, stators, rings, etc.

Mr. Wang looked at the picture and was dumbfounded. No, you usually study this thing? How can it be so detailed?

But there are a lot of things on it that we don’t know what they are… Chief Engineer Wang was very distressed: “Chief Engineer Gao, there are a lot of materials on it. Judging from the brand names, we don’t have any of them now, right? What are the properties of them?”

"We don't have any" is a more restrained way of saying it, but what it actually means is - what the hell are these? I haven't seen them.

It really cannot be blamed on Mr. Wang's ignorance. Gao Zhendong himself knows that there are many materials here that are not available now, but it doesn't matter, because they can be found.

A considerable number of steel materials were included in the steel manual that he was currently dealing with, such as 1Cr11NiW2Mo, and a large number of materials starting with GH3044, GH1015 and GH. As for the remaining small amounts of nickel-based alloys, TC11 titanium alloys and the like, he could also find out how to make them.

Thank you for the gift from my hometown!!!
"Oh, yes, yes, yes, these are new materials you mentioned. We are going to replace the original materials." Gao Zhendong smiled happily.

"So many?" Mr. Wang was stunned by Gao Zhendong's show-off.

Changing materials and replacing new materials are two different things. Although some materials have existed for a long time, it is not difficult to use them after research. However, looking at the picture of Chief Engineer Gao, there are not many things that look familiar to me. In summary, except for 591, I hardly recognize other replacement materials.

This is because 591 covers the ecological niches of several non-casting high-temperature alloys, otherwise he would see more unfamiliar things.

"Yes, that's all. If you want to replace them, you should replace them with better ones. Come, Mr. Wang, take a look at their performance and evaluate my suggestion."

Mr. Wang knows nothing about the performance of these new materials, so it might be inappropriate for him to replace them directly. He has to show them their performance before he can feel confident in making the replacement.

"Okay, let me take a look first."

Gao Zhendong made a phone call and asked the comrades in the Third Factory to send over all the performance tables of new materials related to the Iron and Steel Materials Manual. After the call, he said cheerfully: "We have already made some of them, or are testing them. The data we provide is still very reliable, hehe."

This part of the steel alloy was prepared in advance after he obtained the improved LYP-13FI data from Qianshan. 8 free search opportunities, worth the money.

This operation really surprised Mr. Wang and his team: "Mr. Gao, you started preparing materials for us in advance just for this matter? How can you take this responsibility?"

If we don't listen to your advice, then all your efforts will be in vain, right?

Gao Zhendong was stunned for a moment, then burst into laughter: "If I don't prepare in advance, you probably wouldn't dare to start my replacement plan." Mr. Wang and the others thought that was right. Without certain preparations, Mr. Gao's material replacement plan was really... It couldn't be called radical anymore, it was simply crazy.

This becomes a chicken and egg situation.

This touched them deeply. Chief Engineer Gao had made great sacrifices for the engine improvement work. You know, all his advance preparations might be in vain.

In fact, what Mr. Wang and his colleagues didn’t know was that it wasn’t that exaggerated. They were all sold wholesale. It was just a matter of which ones to pick first.

At this time, comrades from the Technical Department of the Third Factory had already brought over the material performance tables that Gao Zhendong requested. General Manager Wang took them very solemnly. If this improvement was not done well, it would be a shame to Chief Engineer Gao's hard work.

Gao Zhendong asked General Wang and several comrades he brought with him to look at and digest the information first, while he himself wrote the performance tables of the remaining materials by hand.

As Mr. Wang and the others watched, the joy on their faces grew stronger.

"This, this, this... this is tailor-made for the engine!"

"Change it. Only a fool wouldn't change it! It's good to raise the temperature by 50 degrees or reduce the weight by even 1%."

"Well, you know what, the material that Chief Engineer Gao chose is just right, just right for the place he chose..."

Gao Zhendong was happy while listening to it. LYP-13FI was not a good product in the 90s, but it is still very attractive nowadays.

This attraction, including its design and materials, has a bit of a dimensionality reduction feel to gays these days.

Mr. Wang flipped through the material properties table and was amazed. Especially when he saw that most of the conditions were marked with the word "verified", he was so happy that he couldn't stop smiling.

How can I feel so embarrassed? I feel like I'm at a banquet and I have to eat and take things at the same time.

Then he realized, it was gone! The performance table was gone as he was flipping through it!
He looked up at Gao Zhendong: "Chief Engineer Gao, it seems that there are several types that are not included here?"

Gao Zhendong stopped writing and pointed to his head: "Wait a moment, I'll write it for you. The remaining ones are either titanium alloys or nickel-based alloys. I haven't carried out systematic work on them yet. They are still in my mind."

Only then did Mr. Wang realize that steel materials were a systematic project for Chief Engineer Gao. This inference made him respect him very much!

It is needless to say how amazing it is to be able to turn a type of material into a system engineering. Even though Mr. Wang is already a top player in his profession, he still has to pay tribute to Gao Zhendong's amazing operation.

Just as he thought of this, Gao Zhendong finished writing what he was doing and handed it to Mr. Wang: "Come, Mr. Wang, take a look."

TC11 titanium alloy, K417 high temperature nickel-based casting alloy...

Mr. Wang looked at the list that Gao Zhendong had just written and was still warm, and his admiration for Gao Zhendong was like a torrent of water, endless.

“Mr. Gao, titanium alloy is difficult to process. With the support of Northern Technology, we have made some progress in overall forming and are making breakthroughs. However, we do not have the capability for precision machining. Moreover, this TC11…” Mr. Wang frowned as he looked at TC11.

"Don't worry about that. That's why I thought of the R11 imitation work when I came to work in Qianshan. There is a large titanium mine in Shu Province next to Qianshan - Hongmian Vanadium Titanium Magnetite! We are cooperating with this titanium mine to study titanium alloys and titanium alloy processing. You don't have to worry about this."

As expected, Chief Engineer Gao had prepared all the basic conditions, and Mr. Wang felt relieved.

"That's good, that's good. Hey... this K417..."

He rubbed his eyes and looked again carefully.

"Great! Great! With this K417, I can try to use the zero-residue precision casting process on these parts!"

"And this thing is much lighter than ordinary nickel-based alloys, with a density 5% lower!"

A density difference of 5% is quite significant in engine materials, especially when it comes to meeting the harsh working conditions of the engine while also being lightweight.

K417, a nickel-based high-temperature alloy, has a slightly lower melting point than 591, but it is also close to 1400 degrees. However, its casting performance is better than 591 and can be used in some special places.

The similar material they originally used had a specific gravity of about 8.9, but the one Gao Zhendong gave him had a density of 8.3 and better high-temperature performance. How could he resist this?

(End of this chapter)