"Ninety and a half ......"

Ma Liping opened his mouth several times in a row, but in the end he still did not make a sound.

The main thing is that I don't know what to say for a while.

I had to turn my attention back to the operators who were busy around the directional solidification furnace.

As a fellow scientific researcher, he naturally understands the "unspoken rules" in the discourse of some peers.

Being able to name the figure of ninety and a half is basically equivalent to having 100 percent confidence.

It's just that out of respect for statistics and, of course, metaphysics, I won't say it so absolutely.

To be honest, Ma Liping is actually a bit of a drum in his heart.

He has been studying in the field of casting technology for more than ten years, although the level of Huaxia in this area is not high, but he has also been tracking the frontier progress abroad.

Even the countries that have done the best job of "precision" process optimization are still only targeted rather than quantitative.

The final parameters are determined, but trial and error and debugging are still required during the trial production process.

It's just that compared to the experience-trial and error, which is almost purely based on blindness, it is much more efficient.

This is still in the case of improvement on the basis of existing technology.

The current crystal selection method and liquid metal cooling process is completely the first time for Huaxia......

Can you really get into the soul with one shot?

I'm afraid it's not very scientific......

Of course, thinking about it, Ma Liping is not a brainless newcomer who has just entered the workplace, and he will definitely not say this kind of thing.

Just kidding, the other party became the chief engineer of the national key model in his twenties, and his ability and background are all natural, where can he touch porcelain as a professor in his fifties......

Even if you really don't succeed once, at most you will complain in your heart.

Therefore, after a moment of silence, he spoke again:

"If you can succeed at the first time, it is naturally the best......"

As he spoke, the operator had completed the setting of the process parameters and carried out the final inspection in accordance with Chang Haonan's requirements.

"Mr. Chang, Director Ma, the first trial production of DD8 single crystal alloy blades is ready and ready to start."

The section leader who personally led the team trotted over and reported to the two.

Ma Liping did not answer directly, but looked at Chang Haonan next to him.

Although he, the director of the foundry center, has no administrative connection with the latter, there is no doubt who is the person who is talking about this scene at the moment.

However, Chang Haonan is not prepared to transgress this right.

In the Turbofan 10 project, he has no shortage of presence.

There is no need to steal the limelight.

Moreover, Chang Haonan had just heard a somewhat worried tone from the other party's answer after a long time.

"Director Ma, the matter of the Foundry Center, are you the direct leader, or you are the order."

At this moment, Ma Liping was still a little surprised.

In fact, he didn't doubt that Chang Haonan would definitely be able to get this single crystal blade out in the end.

Therefore, this first trial production, which opened a precedent in the whole of China, will definitely remain in the annals of the aviation industry in the future.

And now, that opportunity fell directly on his head.

"Agreed to start trial production!"

Although Ma Liping had already taken two deep breaths in advance, when he said this, there was still a slight tremor and cracking.

And the little bit of doubt in his heart just now, which he may not even have noticed, and the slight idea of waiting to see the joke, also disappeared without a trace with this gaffe that had nothing to do with the overall situation......

At his command, the vacuum pump started working first, followed by the cooling water pump, the heater, the agitator, the linear motor......

A monotonous and piercing roar sounded in the workshop, but no one found the sound unbearable, and still stopped in place.

Everyone wants to see the results of this trial production as soon as possible.

In the end, Chang Haonan felt that after he really entered production, it seemed useless for his group of people to stand here, but it would distract the operators next to him, so he proposed loudly:

"Let's go to the break room first, and then come back when the results are about to come out."

His voice drowned out the rumbling compressor and reached the ears of the crowd.

Ma Liping turned his head to look at Chang Haonan with a surprised expression.

Although logically, he also knew that his researchers did not play a role in the actual production.

But few people can maintain a real stable mentality when their major scientific research results are implemented.

I can't wait to be able to stare at the whole process with my own eyes.

Looking at it this way, the other party is indeed interested in this process...... Quite reassuring.

Ma Liping has been teaching at Liao Provincial University in the non-military industrial system in the past, and he has only joined the Liming Group for a short time, and it is the first time he has directly dealt with Chang Haonan.

Although it has not yet been decided whether the trial production can really succeed at one time, the latter's current calm and calm attitude makes him admire it in his heart.

……

Although Chang Haonan's improved process can produce turbine blades "efficiently", it is compared to the past.

The directional solidification method is lofty, but it is essentially precision casting.

As long as it is precision casting, it is a matter of slow work and meticulous work.

It is said that the blade pulling speed in the solidification process is measured in millimeters per minute.

This process alone can take an hour or more.

Therefore, by the time the entire production process is completed, it is already the afternoon of the day.

Chang Haonan and his entourage returned to the production workshop ahead of schedule and witnessed the whole process of the finished turbine blades being taken out of the directional solidification furnace and then cleaned and cooled.

In the end, after waiting for about half an hour, a group of products was finally handed over to everyone by the section leader-

In general, in order to ensure efficiency, turbine blades are not manufactured one at a time, but in a group, generally 4-6 pieces.

This is true even for pilot production.

Because there are many destructive items in the follow-up testing, it is necessary to prepare some more samples to come out.

On the surface, these leaves appear a little unsightly, even gray, and do not look like the high-tech products that most people imagine.

However, for the insiders present, it can be seen that these products at least do not have defects such as shrinkage holes, freckles, and striped crystals that can be seen by the naked eye at a glance.

Compared to the previous waste models that can go directly into the textbook, it is so good that I don't know where it is.

Of course, the more detailed parts at the crystal level need to be further inspected with equipment.

"Quickly, send it to the testing center for comprehensive testing, especially the alloy morphology and element composition, and get the results as soon as possible."

Ma Liping turned around and handed the sample to an assistant behind him.

Originally, the Dawn Factory generally had to be sent outside for this kind of testing, just like Chang Haonan did two years ago.

But after the establishment of the precision casting center, they spent a lot of money to purchase a batch of equipment, which greatly reduced the time waiting for inspection results.

Soon, several copies of the photocopied X-ray and electron microscopy results were returned.

Ma Liping almost snatched the report in his hand, aimed at the light not far away, took off his glasses and went closer to check it carefully.

"Cross-sectional dendritic structure, cross-petal topography ............"

"The primary dendrite grows in the vertical direction with a spacing of 373 μm, and the secondary dendrite arms are distributed in parallel with a spacing of 80 μm......"

"The average dendrite stem size is 450 nm, and the interdendrite is 670 nm......"

As the report flipped back more and more, his expression changed from nervous to relaxed and finally to ecstasy.

However, just as he turned to the last page of the test report and was already about to open the champagne, the expression on his face suddenly froze.

"The longitudinal segregation coefficient of aluminum is 0.82, the longitudinal segregation coefficient of cobalt is 2.60, rhenium is 12.28, and tungsten is 32.21......"

"γ/γ′ eutectic content 13.6%......"

Ma Liping raised his head with a confused expression on his face and looked at Chang Haonan next to him:

"Mr. Chang, this ...... Isn't this eutectic content a little too high......"

"And...... Moreover, although the overall content of impurity elements is very small, the distribution is uneven, and almost all the rhenium and tungsten elements that affect the performance are concentrated in the roots of the blade, which is very unfavorable for the working stability......"

In fact, when I first heard Chang Haonan say that he could succeed at one time, Ma Liping even wanted to see the other party eat deflated.

But now, when he really saw the result, he felt completely unacceptable.

Obviously, the previous test data is very good, why did this part go wrong in the end?

Ninety-nine bows have been bowed, and the last trembling is not understood, which is the most annoying.

However, Chang Haonan, who was not far away, didn't see that he was in a hurry at all, and was looking down to write down another piece of information......

"Mr. Chang?"

"Director Ma, you're in too much ...... hurry"

After a while, Chang Haonan raised his head again and handed the information in his hand that he had never taken out before to Ma Liping:

"This is a trial production, and we have to carry out a test after each process."

"There is still a heat treatment that has not been completed, and the current blade is only a semi-finished product, so naturally it is impossible to be perfect everywhere."

was said like this, Ma Liping realized that he was embarrassed.

It's not that the last tremor didn't understand, but that people haven't started to tremble at all......

Of course, he didn't know that there might be a follow-up treatment process after the blade was formed, but he was probably too nervous just now, and his mind was in a mess.

Compared with Chang Haonan, who is in charge of process design, he seems to be more concerned about chaos......

Thinking of this, Ma Liping forced himself to calm down, and then looked down at the information Chang Haonan had just given.

It's a dense, multi-page table.

He quickly saw that this was a table of parameters for the heat treatment process.

And each process corresponds to the different defects of semi-finished products.

In other words, Chang Haonan has predicted the possible test results in advance and made different heat treatment schemes.

Now it's just a matter of selecting by the table!

At this moment, Ma Liping suddenly felt ......

So be it.

He had been curious about how Chang Haonan was going to deal with the differences in products caused by equipment and environmental fluctuations in the crystal casting process.

As a result, they directly calculated it all......

At the same time, Chang Haonan has handed over the selected heat treatment parameters to the section leader who has been waiting next to him:

"You should have seen the process of selecting the process just now, just follow my method in the future, and deal with it!"

The waiting process that followed, compared to before, seemed a little boring.

Chang Haonan's preparation has reached this outrageous level, even if everyone was a little worried about the final result of the trial production just now, they have basically stabilized their mentality now.

Not surprisingly, when the final sample results were sent back after heat treatment, the elemental segregation and eutectic structure had been greatly mitigated, and the γ′ phase content had been increased by almost a third compared to before.

In other words, it's almost a perfect DD8 single crystal!

"Turbine blades, that's ...... Made? ”

He Ming, who hadn't opened his mouth much just now, only felt that this world seemed a little unrealistic.

Chang Haonan didn't answer his question, just put the blade in his hand back into the box, and then turned around:

"Well, now that this problem has been overcome, the production of the combustion chamber and the turbine should also be on the agenda!"

(End of chapter)