Ten minutes later, Mu Yang came to the titanium alloy factory again.

Long Xuan saw the boss arriving and handed him the printed data. At the same time, her face could not hide her excitement: "Boss, the data of TC4 produced with part number 410 is really exaggerated. The mechanical performance data exceeds the standard by a lot.

, and the harmful elements were much lower. I couldn’t believe it. I thought the measurement was wrong.

However, we took a total of three groups of materials as samples, and each group took four samples. This is the case for 12 data;

As for the batch of materials we smelted, the data is relatively normal."

Mu Yang took the experimental report, and Long Xuan explained to him that the labels had been prepared.

Assume that the plate thickness is 12 mm, and the performance is measured at room temperature.

The normal main mechanical property standards (annealed heat treatment state, civil use) are: tensile strength σb/MPa ≥ 895, elongation δ5 (%) ≥ 10;

The normal main mechanical performance standards (solid solution heat treatment state, higher requirements) are: tensile strength σb/MPa ≥ 1100 (three times that of commonly used steel Q235B), elongation δ5 (%) ≥ 10.

Generally speaking, aerospace titanium alloys require solid solution treatment (which can eliminate internal stress at the same time, otherwise fatigue cracks are prone to occur).

Two relatively powerful titanium alloy manufacturers in China produce TC4 with a tensile strength between 1100-1250MPa and an elongation between 12% and 20%.

However, currently, high-end aviation titanium alloys still rely on imports due to unstable performance and many impurities.

The material experiment Mu Yang asked Long Xuan to do was through solid solution treatment.

He looked at the experimental data for Long Xuan's batch of materials and found that they barely met the minimum requirements and were slightly worse than the two domestic ones.

One set of data is on the low side. The tensile strength is between 1010-1050MPa. The tensile strength is a bit low. It can definitely be used, but if it is used in aviation, it does not meet the design requirements unless the requirements for materials are reduced.

In terms of processing performance and high-temperature creep resistance, the processing speed is slow and it is only suitable for parts that work for a long time below 400°C. At 400°C, the tensile strength drops quickly, with an average of only about 801.3MPa (if it is in the annealed state, it is only five or six hundred MPa)

about).

If the temperature reaches 800°C, the tensile strength drops sharply, with an average of only 73.2MPa. This strength must not be used.

Comparing the set of TC4 materials debugged by Muyang, the experimental data are obviously different.

The tensile strength is between 1300-1450MPa, the elongation is between 20%-26%, and harmful elements such as hydrogen, carbon, and oxygen are much lower; the processing performance is good, and the high-temperature creep resistance is good, and it still remains at 550°C.

It has a performance of 800MPa and can work at this temperature for a long time.

When the temperature reaches 800°C, the tensile strength also drops sharply, but it still has a performance of 400MPa, which can be said to have high-temperature performance.

However, when the temperature reaches 1000°C, the average tensile strength is only a few tens of MPa. At this temperature, the material has no usability.

These data are better than Mu Yang expected, and the overall performance has been greatly improved.

The optical tensile strength has increased by about 30%!

Elongation, the numerical value is about double! The actual toughness is more than doubled and cannot be measured by numerical values ​​alone.

It can be said that the overall performance is a qualitative improvement.

It is even much better than the titanium alloys produced by the best titanium alloy manufacturers in the world, especially in terms of processing performance and high-temperature creep resistance, which directly beats international manufacturers.

Another example is elongation. Generally speaking, it is difficult to make TC4 into shaped materials (such as L-shaped steel) because of its poor plasticity;

However, Muyang's TC4 has an elongation of 20%-26%, which already has the foundation for cold-rolled formed products.

It was really exaggerated, no wonder Long Xuan was shocked.

"Very good. Again, keep it confidential! You should know what these data represent."

After Mu Yang read the experimental data, he returned the information to her.

"Boss, I understand what it means! Our TC4 has already stood at the highest peak in the world." Long Xuan nodded solemnly, feeling very proud in her heart.

Mu Yang saw her nodding and then ordered: "Produce a few more batches and conduct more tests to see if the data is stable; if it is stable, proceed to TA7 production. The workpiece number is 710 and the same specifications and dimensions.

At the same time, additional tests were conducted on welding performance, low-cycle and high-cycle fatigue strength, isotropy, KIC, DT, residual stress and other experiments, and were tested in accordance with the performance requirements of military aviation titanium alloys."

"Okay, boss, we haven't applied for the Fourth Industrial Certificate yet. If you want to use the market, you need to apply." Long Xuan mentioned a very important matter.

Even if Xinghai Group can produce titanium alloys with superior performance, it is not easy to enter the commercial market. It is mainly a question of qualifications.

In the field of titanium alloy materials for military use, in addition to obtaining the "Four Certificates of JunGong" (National Military Standard Certification, Confidentiality Certification, License Certification, and Directory Certification), manufacturing companies also need to conduct a large amount of research and development work by participating in JunGong supporting projects.

, it is possible to enter the formal development stage of the project through supporting project bidding.

After that, you need to pass the process review, material review, ground function test, ground static test, installation assessment, and installation review before you can become a qualified supplier of materials for the relevant model. The whole process takes a long time, and it is normal for one or two years, or even

longer.

Therefore, the JunYong titanium alloy material business has the typical characteristics of long investment period and high return period, which makes the entry barrier high for ordinary titanium alloy manufacturers with weak capital and R&D capabilities.

Of course, this certification process depends on Junfang. If it is quick, it can take a few months.

Mu Yang understands that this process does require various complex experiments, and the time cycle is relatively long.

He doesn't like these rules and regulations very much.

But if we really want to use the market and make money in China, we have to listen to the advice of the emperor.

If it is not for royal use, it can be used for experiments or put on the civilian market.

Titanium alloy is a raw material, not a finished product, and the restrictions are different.

For example, if Xinghai Group wants to build rockets, is that okay?

Definitely not!

Because there is no production qualification and four certificates from Jun Gong, it does not mean that you have the ability to train, and you are not even allowed to do experiments.

When Xinghai Materials Co., Ltd. was registered, it already specified its business scope such as non-ferrous metal production and processing. It is okay to produce titanium alloy plates.

However, when it comes to high-performance titanium alloy materials, if he wants to enter the civilian market, he may be restricted from listing due to excessive performance and can only sell to Junfang.

Of course, it’s okay if you don’t need to achieve such good performance or limit the quantity.

The above is not allowed to enter the civilian market, it is just a possibility.

Specifically, Mu Yang had to ask people from the company to first register and apply with the H City National Defense Science and Technology Industry Management Department and other departments.

It is still far away from mass production, and Muyang plans to move the equipment to the headquarters base before proceeding.

After the National Day, some factories at the headquarters base can be put into use, but it will only take more than a month.

After Mu Yang thought deeply, he explained to Long Xuan:

"After the experiment, pack the equipment and transport it after the National Day. If it cannot be transported as a whole, it can be disassembled and moved again, but it must be labeled in advance to facilitate reinstallation. I will arrange the fourth certificate of work, and you can do the experiment

Just do it.”

Mu Yang glanced at the equipment in the factory, which was quite a lot, including a 2400kwEB furnace, a 15-ton vacuum consumable electric arc furnace, a mixed distribution system, a 10,000-ton hydraulic press, a rapid forging machine, a 10,000-ton free forging machine, and a vacuum plasma welding box.

3.3-meter reversible hot rolling mill train, 1.2-meter four-roller reversible hot rolling mill train, cold rolling mill train, vacuum annealing furnace, sanding machine and other equipment.

Many of them are imported from Germany, Austria and island countries, and then modified in their own factories, mainly adding automatic operating systems.

Of course, not all equipment needs to be disassembled.
Chapter completed!