"What are you doing here?"

At this time, another voice sounded and asked. Pen & Fun & Pavilion www.biquge.info

"It's all about quenching. Yu Hui was a little impatient.

"Boy, it's not me. The system said.

Well?

Yu Hui immediately reacted that this was not the voice of the system, and turned around to see a middle-aged man looking at his actions curiously.

This man is a little strong, tall and mighty, especially the muscles of his arms bulging, and he is very powerful.

The middle-aged strong man was dull for a while, and asked curiously. "What do you say, what is quenching......

The so-called quenching is a process in the processing of metal materials. To put it simply, the metal workpiece is heated to an appropriate temperature and held for a period of time, and then immersed in a quenching medium for rapid cooling. After forging various irons, the reddened irons are quickly immersed in water for cooling, which is a method of quenching.

Quenching and tempering, annealing, normalizing and other processing processes, collectively known as heat treatment processes, are important means used to improve the properties of materials. By accurately controlling the medium, temperature, time and other factors in the heat treatment process, the toughness, strength, hardness, wear resistance, fatigue strength and other factors of the material can meet the specified requirements, which can be described as unfathomable.

Yu Hui was helpless. "Dip in the fire, you know. ”

He has a feeling that he is teaching the cook to settle accounts, but he is also a settling account, and as an all-rounder, alas, everything will be trouble, and he is too good.

"Oh, I know about the war. The strong man said.

Yu Hui, who was previously an interstellar soldier, is also very familiar with machinery and has an in-depth understanding of heat treatment processes. He just glanced at the farm tool he borrowed from Uncle Wang's house next door, and knew that it had not been quenched. Although the material is a steel with excellent toughness and wear resistance, if it is not properly quenched after machining, the steel will become soft, resulting in the current curling phenomenon.

This person is estimated to be a layman, and he knows nothing about the problems in iron processing technology, and even the word "quenching" said by Yu Hui, they can't react at once. According to the dictionary explanation, the word "quenching" should be pronounced "brittle", but in the heat treatment profession, people are accustomed to pronouncing the sound of "war", which is derived from the word "dipping fire" in the traditional folk of the north.

So Yu Hui doesn't explain too much, you can understand it, if you don't understand, you can only understand it.

Yu Hui took out the heated shovel head again at this time, but did not throw it directly into the water, but threw it into a pile of ashes next to it to keep it warm.

This practice is called tempering and is one of the major processes of heat treatment.

Just now Yu Hui said that he wanted to quench these farm tools, in fact, it was just a popular statement, what he wanted to do was to integrate various processes such as normalizing, tempering, and quenching to achieve comprehensive heat treatment of the workpiece.

"Young man, what are you doing here? The middle-aged strong man was surprised, "Isn't it water for quenching? It's time to throw it into the basin, huh?"

"Have you ever heard of oil quenching?" asked Yu Hui rhetorically.

"Oil quenching...... I seem to be a little impressed. The middle-aged strong man said.

The so-called oil quenching is to use vegetable oil instead of water as the quenching medium, and the quenching effect is different from that of water.

Many blacksmiths know that some iron tools are better quenched with oil, but due to the high cost, they are not used much in practice.

The scientific and technological ability of this society probably has not yet allowed them to master the technology of oil quenching.

"This farm tool was originally quenched, but it was used with water, and it will be wasted after a year or two!" Yu Hui said. "Now I take it back to the furnace and quench it with vegetable oil, and the effect will be more than doubled! If it is well maintained, it will be used for ten or eight years, at least I dare to use it for three or five years, and it will be very solid, just don't hoe hard things like stones." ”

The quenching of steel is a heat treatment process in which the steel is heated to a temperature above the critical temperature Ac3 (sub-eutectic steel) or Ac1 (pereutectic steel), held for a period of time to make it fully or partially austenitized, and then cooled to below Ms (or isothermal near Ms) at a cooling rate greater than the critical cooling rate for martensite (or bainite) transformation. Solution treatment of materials such as aluminum alloys, copper alloys, titanium alloys, tempered glass, etc., or heat treatment processes with a rapid cooling process, are also commonly referred to as quenching.

The quenching process is widely used in the modern machinery manufacturing industry. Almost all of the important parts in machinery, especially the steel parts used in automobiles, airplanes and rockets, have been quenched. In order to meet the wide variety of technical requirements of various parts, various quenching processes have been developed. For example, according to the part to be treated, there are whole, local quenching and surface quenching, according to whether the phase transformation is complete during heating, there are complete quenching and incomplete quenching (for sub-eutectic steel, this method is also called subcritical quenching), according to the content of phase change during cooling, there are graded quenching, isothermal quenching and under-speed quenching.

Yu Hui said again. "My reasoning is similar to oil quenching. Different materials and different applications require different quenching processes, which involve the use of different media. I don't have time to tinker with too many things now, and this trinitrate aqueous solution I use is the most suitable for this kind of steel. ”

The middle-aged strong man of "Sanni ......" was completely frightened by Yu Hui.

If you want to say that Qin Hai is wrong, he is right;

But if you want to say that he is right, what kind of thing as trinitrate water, he has never heard of it, could it be that this young man knows more things than he is an old blacksmith?

That's right, this person is Tie Laosan, the owner of the only blacksmith shop in the village!

All the iron tools in this stockade, farm tools, firewood knives, weapons and so on, are all made by Tie Laosan!

Including, the shovel in Yu Hui's hand.

If I'm not mistaken, I really called Uncle Wang next door more than a year ago, about twenty months!

Each of his works is marked with a mark, and you can recognize at a glance who and who you typed it for. Just like the shovel in Yu Hui's hand, there is a small word "king" faintly.

This courtyard was previously inhabited by a person surnamed Lin, but it was later killed by the government, and this courtyard was left empty and abandoned. Later, Yu Hui came, and Yan Wan let Yu Hui move in after cleaning up.

Tie Laosan naturally knows that a lot of iron tools in this village are usually reimbursed after one or two years, and the scrap iron is brought back to Tie Laosan here to return to the furnace, and he will beat out whatever everyone wants!

Especially shovels and firewood knives.

This young man dared to boast that he could use it for ten or eight years after his quenching!

I almost believed it.

Tie Lao San is almost going to kill you!

But I hope that this person is extraordinary, and he is very measured in his conversation, not like the kind of person who speaks wildly, then let's see what he has to rely on.