Chapter 1030 I Am Cracked

At this time in August 2002, the Turbofan 10 had been finalized, and the Turbofan 20 project had not yet been officially approved. It happened to be in the gap between the two major models.

For the current aviation power group, Chang Haonan's task at hand is the first priority.

Even among the entire Science and Technology Committee sequence, its importance is at the forefront.

Therefore, his request naturally received a quick response from his superiors and fraternal units.

Especially 621.

Although Institute 621 was retained under the umbrella of the Aviation Industry Corporation of China during the split that year, a research and development team was organized to rush to Haojing in the shortest possible time.

Even came earlier than professors from two local universities...

Chang Haonan didn't do too much, and directly received a group of technical staff from the other party in the archives dedicated to the project team.

Sure enough, the effect is outstanding.

When the leader saw a filing cabinet full of information in front of him, he was so shocked that he even dropped the briefcase in his hand.

After staring blankly at the door for a while, he noticed Chang Haonan sitting not far away.

For a moment, the surrounding atmosphere was a little awkward——

What should I do if the leader is ignored on the first day of reporting? Waiting online, very urgent.jpg

Finally, Chang Haonan stood up and half-jokingly took two steps forward:

"I heard before that Researcher Hang Zhibin could forget about his wife when he fell in love with research materials. When we met today, he really lived up to his reputation..."

Several people following Hang Zhibin also let out a burst of good-natured laughter in cooperation, finally making the scene lively again.

"Hello, Mr. Chang."

Hang Zhibin quickly shook hands with Chang Haonan, and then said:

"Originally, after hearing about your situation two days ago, my mentor Cao Xiaochun, Academician Cao, was planning to come over in person. However, because he suddenly felt unwell, he had to temporarily let me lead the team. I hope Mr. Chang can give me more advice... …”

Cao Xiaochun, a leader in the 621 Institute specializing in titanium alloy materials, has presided over the research and development of a series of titanium-aluminum alloy materials and processing techniques, including TC2, TC4, and TC11.

Due to this outstanding contribution, he was elected as an academician of the Chinese Academy of Sciences in 1997.

To a certain extent, the reason why Chang Haonan was able to quickly apply his knowledge to the field of aviation design after his rebirth in 1996 without encountering particularly great resistance in materials was because he had received a lot of scientific research from Academician Cao Xiaochun. dividend.

High-temperature-resistant titanium alloys that can withstand working temperatures of 550°C or even higher are its current focus.

Of course, although it is said to be tackling key problems, it is actually just entering the exploratory stage.

China has indeed developed several titanium alloy materials used in aerospace engines in the past.

But those are used for fans and compressors, which are cold-end components.

It is completely different from Luo Luo, who directly goes to the turbine.

Now Chang Haonan suddenly got thousands of pieces of information, and it was also information certified by Luo Luo.

The 621 Institute naturally hopes to see it as soon as possible.

"Any advice... we can't talk about it yet."

Chang Haonan motioned to the people at the door to sit down around a small table:

"I came to you this time mainly because I need your support in the research and development of titanium alloy materials. After all, Haofa... In fact, including myself, I have not done much systematic research on titanium alloy materials in the past. I only relied on the British Sometimes the things people give are not enough..."

After all, China did not directly introduce a full set of technologies, so it is naturally impossible for Rolls-Royce to really provide complete information——

It is still difficult to process on the basis of semi-finished blanks, let alone reverse engineering to produce high-temperature titanium alloys with the same or equivalent technology.

At least it's not just a matter of following the information.

"Where is it... Our research team has been paying attention to the direction of computational materials science proposed by Mr. Chang before. There are still many details that we would like to take this opportunity to confirm with you..."

…

In fact, titanium alloy materials should be divided into two directions.

Some people are responsible for developing the laser processing process, while others are responsible for researching the materials themselves.

However, in the early stages of research, what needs to be done on both sides is exactly the same.

Make representations.

Although the information provided by the British side already includes the microscopic morphology and metallographic structure, this process is still indispensable after it is in China's own hands.

Because the representation object is not just the semi-finished product itself to be processed.

There are also materials that have been processed by different processes, especially laser processing with different wavelengths and pulse widths.

In terms of performance, they can only be regarded as waste products produced during process development.

But for materials science, especially the computational materials science that Chang Haonan is studying, the waste products themselves are also valuable.

Of course, the test does not require Chang Haonan to do it himself.

However, the construction of material type spectra and related databases, as well as the interaction between titanium-aluminum-chromium-niobium-oxygen particles, still require his decision to build these.

To talk about the composition of titanium alloys like the British, it is not complicated.

Ti-47Al-2Cr-2Nb.

Referred to as 4722.

For Chang Haonan, it is considered a classic product of a generation.

So much so that when he saw the results for the first time, he was not surprised at all.

Because even in the last life, its improved version 4822 was the world's first high-temperature resistant titanium alloy to be put into practical application.

It was only used by General Electric on the GEnx, which is the engine of the 787.

As for the material itself, it was developed earlier.

Now it seems that the reason why it was not applied in advance is probably mainly because it encountered great difficulties in processing.

After all, if it weren't for him, the Trent 900 would most likely have to replace the low-pressure turbine with a nickel-based alloy.

Therefore, after the initial preparation stage, Chang Haonan was ready to overcome difficulties.

But even so, the situation later was still somewhat beyond his expectations-

At first, Chang Haonan's plan was to use other brands of titanium-aluminum alloys for algorithm and process testing, to form a database like nickel-based alloys, and then try to process 4722 materials.

After all, the number of semi-finished blades provided by the British is limited.

Although the contract stipulates that normal use during the trial production process is not included in the processing loss, and Rolls-Royce can also provide new samples later.

But not only does international mail take time, but more importantly, the terms also state that all processing waste materials must not be disposed of at will and must be returned to the British side.

On the surface, this is nothing strange.

But it means that if the entire process development process is tested using the materials provided by Rolls-Royce, then the other party may be able to infer some useful information from these waste products.

However, in this kind of thing, the initiative is still on the Chinese side.

Therefore, Chang Haonan thought of using other grades of titanium alloys that can be produced independently for preliminary tests.

It is equivalent to giving the other party only one answer in the end, and the process is a big "omission".

Anyone who has been to school should understand this kind of lethality.

However, according to the process parameters fitted by this process, cracks appeared in the first sample test.

It is not even the kind of microcracks that require a microscope to see clearly.

It is a macro crack...

"Mr. Chang, according to the test results, the internal shape of the channel basically meets the standard, but the appearance of the hole wall is very pessimistic."

Lu Qingsong, who was also sent from the 606 Institute, came to Chang Haonan's temporary office with a test report and a sample in his hand:

"After the probe goes in, you can see very obvious warping, as well as defects such as burrs, and the cracks that spread from these defects, some of which can even penetrate the part between two adjacent air film holes..."

"Put it down first..."

The latter was also holding a photo of the sample in his hand and was in a dilemma. After seeing him coming in, he sighed with a headache and then pointed to the only place on the desk that was not filled with data:

"Also, let the trial production team pause for a while. There are obviously some places that we haven't noticed, which were ignored during the calculation process."

"Okay."

Lu Qingsong nodded, but did not turn around and leave immediately.

As an engineer who participated in the development of ultra-short laser processing technology, he had some ideas of his own:

"Mr. Chang, what should we do next? Adjust the calculation process and fitting parameters first?"

But Chang Haonan shook his head:

"The deviation of the processing result this time is a bit large. It may be difficult to solve it by adjusting the process parameters alone. We have to adjust the process flow."

Speaking of this, he leaned back in his chair, his face hesitant, obviously struggling with something.

After a long while, he suddenly continued:

"We have to adjust the strategy... Together with Researcher Hang, we should first understand the material forming mechanism and process!"