One night, Bai Yujing couldn't remember when he fell asleep, and the next morning, when Bai Yujing opened his eyes, he found that Shi Yuhan and Qi Lingbai had rolled together. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Looking at the harmony between Lori and the girl, Bai Yujing ate the tofu twice, got up and walked to the door to observe what happened to the goalkeeper Pikachu.

When he came to the door, Pikachu, the roaring dog, was squinting and sleeping on one of its soft cushions, and when Bai Yujing came over, he just moved his ears and sniffed the tense muscles just now and relaxed, and continued to sleep.

Sure enough, it's the same as Bai Yujing thought, don't look at how the canine animals sleep, they will wake up immediately once they are alert, some people say that my dog can't be pulled alive or dead, that is because it smells and hears that it is his own family owner is coming, there is no need to get up, if you are an outsider to come, it will be difficult to say.

Bai Yujing gently picked up Pikachu, the whistling dog, and then found a stool to sit down, while observing the situation outside, he used his hands to tickle it, Pikachu, the whistling dog, also has the habit of a canine, with Bai Yujing's tickling and touching, Pikachu made a comfortable Ulu Ulu sound.

During this period, Bai Yujing found that there were some scattered sounds in the room not far away, which was estimated to be a human who was hiding, and the bad thing was that Bai Yujing found the street corner in the distance through his excellent power, and flashed the shadows of several monsters.

Maybe this is what they sent out to serve, after all, another day has passed, and the conflict and battle should enter a stalemate stage, and the monsters will probably have to allocate their forces first, and then continue to fight to the death, the disadvantage is that there will be more and more monsters, and the good thing is that they should not be in the large-scale search stage.

Bai Yujing teased the dog while thinking about this state until the two girls woke up, after a hurried breakfast, the three of them started a new round of busyness, this time to make weapons, after Qi Lingbai's thinking and Bai Yujing's own knowledge of the combination of unanimously decided to use Damascus steel to forge knives when there is no super alloy or enchantment, magic weapons, and at the same time smelt Bai Yujing's weapons from the new.

Damascus steel is a broad name, and modern refers to steel with a pattern on the surface. In ancient times, it was called Uzi steel. In the Middle Ages, India produced a kind of "Uzi steel ingot", which was the top steel used to make swords, and every year Arab merchants imported large quantities of steel ingots to India for weapon manufacturing. This kind of steel will have a special pattern --- Muhammad pattern on the surface when it is cast into a sword, so it is a cast pattern steel in the pattern steel, which is different from the welded pattern steel formed by folding and forging. Because the pattern can make the blade microscopicly jagged (indistinguishable with the naked eye), it makes the sword sharper.

Scientists of the world have carefully studied and documented the manufacturing methods of Damascus steel. Throughout the ****** world, swordsmiths had access to these records, but they kept them a secret with absolute loyalty, because in an era when war was won or lost by cold weapons, Damascus steel was of extraordinary value, because it perfectly combined the two contradictory properties of hardness and toughness in that ancient era, and kept the blade sharp for a long time.

The process of the loss of Damascus steel has always been a mystery. As we all know, high carbon content is the key to the steelmaking process, but if it is not controlled well, it will become the weakness of steel. The high carbon content results in a sharp edge and good retention, but the amount of carbon in the overall mixture is almost uncontrollable. The product with too low carbon content is wrought iron, which is too soft to be used in weapon manufacturing; The product with too high carbon content is cast iron, which is too brittle. If the process is wrong, the steel becomes a large discus of iron carbide, an iron that is so brittle that it is unbearable.

During the Crusader era of 1095-1270, European swordsmiths tried different ways to fold steel and iron, or treated steel with silver and acid to mimic the corrugated structure of Damascus steel, but without success.

This folding technique was also used by swordsmiths all over the world, such as the Celts (Scottish Highlands) in the 6th century BC, the Vikings (Vikings) in the 11th century AD, and the RB people in the 11th century, but none of them could reach the supreme level of Damascus steel, which is both rigid and soft, and has a gorgeous appearance. But here's the strange thing: ****** metallurgists can control the inherent brittleness of high-carbon raw materials and forge them into weapons used in battle. However, even for its inventor, the ****** cutler, this skill was inexplicably lost in the mid-18th century.

In modern times, a new kind of Damascus steel has begun to appear again, which is the powder metallurgy model Damascus steel. Its production arose due to the desire to make stainless Damascus steel. (There are two categories of stainless steel, chromium stainless steel and nickel stainless steel, nickel can not be applied in many fields due to its obvious carcinogenic effect on animals, and the natural reserves are small, the price is high, except for special occasions, its popularity is much less than that of chromium stainless steel, in the United States and Europe in the last century, after prohibiting the use of nickel-containing materials in materials that are in close contact with people, the output and demand for nickel stainless steel began to decrease significantly.) ）

In addition to finding a new generation of high-quality tool steels, they also have stainless steel and Damascus patterns. However, chromium stainless steel Damascus steel can not be forged for production, because forging Damascus steel requires layered welding, but the melting point of chromium oxide generated by chromium stainless steel heating is higher than itself, and the principle of forging welding to remove the oxide layer between layers is that the forging is heated to above the melting point temperature of the oxide layer, and when it is lower than the melting point temperature of the forging, the molten oxide is forged to break out of the gap between each layer.

If the melting point temperature of the oxide layer is higher than the melting point of the forging, the oxide hinders the welding realization. Therefore, there are only two ways to produce forged high-chromium stainless Damascus steel: either to find an auxiliary material that can reduce the melting point of oxides, or to anaerobic forging. So far, no suitable solution has been found for either of these points.

Of course, the hardness and sharpness of this modern Damascus steel are also quite good, and it is currently used by the known forging workshops of various countries, and the production is more complex but the income is also quite high, according to the video that Bai Yujing has seen, the full swing can cut off the bodies of two pigs, which shows its sharpness, and there are any scratches on the appearance.

Turn on the high-temperature furnace today, Bai Yujing, what they have to do is to forge a modern Damascus steel ingot that is enough for three people.

To be continued