Chapter 1030 I’m cracking
At this time in August 2002, the Turbofan 10 has been finalized, and the Turbofan 20 project has not yet been officially approved, just in time for the gap between the two major models.
For the current aviation power group, the task at hand of Chang Haonan is the first priority.
Even among the entire Science and Technology Commission sequence, its importance is at the forefront.
So his request naturally received a quick response from his superiors and brother units.
Especially 621.
Although Institute 621 was retained under the jurisdiction of the Aviation Industry Corporation of China during the split, a research and development team was organized to rush to Haojing in the shortest possible time.
He even arrived earlier than professors from two local universities...
Chang Haonan did not make too much fuss and directly received the other party's information in the archives dedicated to the project team. A group of technical staff.
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 at the door for a long time, I noticed Chang Haonan sitting not far away.
For a while, the atmosphere around me was a little awkward -
What should I do if the leader is ignored on the first day of reporting? Waiting online, quite urgent.jpg
In the end, Chang Haonan stood up and half-jokingly took two steps forward:
"I heard before that Researcher Hang Zhibin can forget about his wife when he takes a fancy to research materials. When we met today, he really lived up to his reputation..."
A few people following Hang Zhibin also shouted in cooperation. The good-natured laughter finally made the scene lively again.
"Hello, Mr. Chang."
Hang Zhibin quickly shook hands with Chang Haonan, and then said:
"Originally, I heard from you two days ago After the situation, my mentor Cao Xiaochun, Academician Cao, was planning to come over in person, but 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 terms of materials was also because he had learned a lot Scientific research dividends from Academician Cao Xiaochun.
High-temperature titanium alloys that can withstand working temperatures of 550°C or even higher are the current focus of their research.
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 you to be there. The research and development experience in titanium alloy materials is supported. After all, Haofa... In fact, including myself, I have not systematically studied titanium alloy materials in the past. Just relying on these things provided by the British is not enough in some cases. ..."
After all, China has not directly introduced a full set of technologies, so it is naturally impossible for Rolls-Royce to really provide complete information——
Those who want to use semi-finished blanks Basically, it is difficult to process, 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..."
...
Actually, titanium alloy materials should be divided into two directions.
Some people are responsible for developing laser processing technology, and 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.
Making representations.
Although the information provided by the British side already includes 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 to be processed itself.
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 itself is also valuable.
Of course, Chang Haonan does not need to do the test himself.
But the construction of the material type spectrum and related databases, as well as the interaction between titanium-aluminum-chromium-niobium-oxygen and other particles, still require his decision to build them.
The composition of the British titanium alloy is not too complicated.
Ti-47Al-2Cr-2Nb.
4722 for short.
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 previous life, its improved version 4822 was the first high-temperature resistant titanium alloy put into practical applications in the world.
It's just used by General Electric on the GEnx, which is the 787 engine.
As for the material itself, it was developed earlier.
Now it seems that the main reason why it has not been applied in advance is that it encountered great difficulties in processing.
After all, without 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 already ready to overcome the difficulties.
But even so, what happened later was still somewhat beyond his expectations——
At the earliest, Chang Haonan’s plan was to use other grades of titanium-aluminum alloys to test algorithms and processes, like nickel-based alloys. First form a database, and then try to start processing 4722 materials.
After all, the number of semi-finished blades given by the British was limited.
Although the contract stipulates that normal use during the trial production process will not be included in the processing loss, and Rolls-Royce can also provide new samples later.
Not only will international mail be delayed, but more importantly, the terms also state that all processing waste must not be disposed of at will and must be returned to the British side.
On the surface, this is not surprising.
But it means that if the entire process development process is tested using materials provided by Rolls-Royce, then the other party may be able to infer some useful information from these waste products.
However, after all, the initiative in this kind of matter still lies with China.
So, Chang Haonan thought about doing preliminary experiments with other brands of titanium alloys that could be produced independently.
It is equivalent to giving the other party only one answer in the end, and the process is a big "omission".
Anyone who has gone to school should understand this kind of lethality.
However, according to the process parameters fitted through this process, cracks appeared during the first sample test.
Not even the kind of microcracks that require a microscope to see clearly.
But macro cracks...
"Mr. Chang, according to the test results, the internal shape of the hole channel basically meets the standard, but the appearance of the hole wall is very unoptimistic."
Lu Qingsong, who was also sent from 606 Institute, came to Chang Haonan's temporary office with a test report and a sample in his hand:
"After putting the probe in, you can see very obvious things. There are obvious warpage and defects such as burrs, and some of the cracks that spread from these defects can even penetrate the part between two adjacent air film holes..."
"First Put it down..."
The latter was also holding a photo of the sample in his hand and was having trouble. After seeing him coming in, he sighed with a headache, and then pointed to the only place on the desk that had not been touched. A place full of information:
"Also, let the trial production team pause for a moment. There are obviously some things that we have not noticed and were ignored during the calculation process."< br>
"Okay."
Lu Qingsong nodded, but did not turn around and leave immediately.
As an engineer who has been fully involved in the development of ultra-short laser processing technology, he has some ideas of his own:
“Mr. Chang, our next step is to prepare to adjust the calculation process and simulation first. Parameters?”
But Chang Haonan shook his head:
"The processing results this time have a bit of a deviation. I'm afraid it's difficult to fix it just by adjusting the process parameters. We have to adjust the process flow."
After saying this, he leaned back on the back of his chair, his face expressionless. There was some hesitation, obviously he was struggling with something.
After a while, he suddenly continued:
“We need to adjust our strategy... Let’s work with Researcher Hang to understand the material forming mechanism and process first! ”
(End of this chapter)