A flying object with a speed of one thousand meters per second collides with a steel plate, and the time taken for the impact is microseconds, such a short time, human eyes can't see clearly, plus the explosives in the shell exploded, so all people see is a puff of smoke.

Everyone looked at each other, not knowing what was happening in the road, and when the smoke cleared, a large hole appeared in the target plate, and it turned out that the shell had penetrated 1,000 mm of homogeneous steel armor.

At this time, among the crowd, some of them let out a slight exclamation, but some of them tightened their eyebrows, Lin Yuan smiled: "Everyone has seen the power of our Ryukyu naval guns, at a distance of one thousand meters, 1,000 mm of homogeneous steel armor has been directly pierced." ”

Lin Yuan looked at everyone and said proudly: "The various composite armor used by the warships in the world today can reach 1,000 mm when converted into homogeneous steel armor?" So, the armor of the Japanese warship is like a tissue paper in front of us. ”

Before Lin Yuan's words fell, an old man in his fifties and sixties stood out of the crowd, said something, and the translator said: "This gentleman is a reporter from a German newspaper, named Ingnex, and he hopes to go to the target site to have a look. ”

Lin Yuan looked at the Inix and thought, "You are still pretending to be like me, you are still a reporter!" You're clearly an artillery expert, and you watched that artillery carefully when you looked at it just now! That look in his eyes, I can't wait to see through the artillery. ”

Lin Yuan smiled: "Of course you can, who else wants to go to the target site to see it." ”

Then the translators of the four countries translated Lin Yuan's questions one by one, and seven or eight people in the crowd raised their hands, Lin Yuan thought to himself: "It seems that this group of people is not easy to fool!" ”

To the unsavvy, a depth of 1000 mm is remarkable, but they ignore an important question: what kind of armor is worn?

An important parameter to measure the performance of armor steel is the surface hardness, the steel with large surface hardness is not easy to be broken down, different steels, the surface hardness varies greatly, especially the steel that has not undergone heat treatment, the surface hardness is lower, and the use of different heat treatment processes also has different effects on the surface hardness of the steel.

When Inix saw that the shell had penetrated 1000 mm of steel armor, the first thought in his mind was: Is this young man who explained to us lying to us? What kind of steel is used for the 1000 mm steel armor he is talking about? With this in mind, he proposed to go to the scene to have a look.

Lin Yuan looked at them and sneered secretly, thinking to himself, "We have been prepared for this trick for a long time, and we are afraid that you will not go to the scene to see it." So Lin Yuan put on a gentle smile and said, "It's good, I have no reason not to agree to my friends' requests, so I'll send a signal and let the carriage come and pick everyone up." ”

Lin Yuan waved the red flag vigorously in the direction of the target board, and also waved the red flag twice, Lin Yuan's face changed after seeing it, and said: "There are some small situations in the shooting range, I can't go over now, please wait for a while." ”

Inix frowned and asked, "What's wrong?" ”

Lin Yuan said: "Some of the explosives in the warhead have not exploded, and our people are dealing with them. ”

Inix's eyes widened and asked, "What did you say?" Such a high-speed shell, hitting the target board, actually had explosives that did not explode! ”

Lin Yuan put on an innocent expression and said, "It may be that the medicine chamber ruptured during the high-speed impact, resulting in the explosive transmission charge not detonating the explosives behind. Lin Yuan's statement is also well-founded, in the design of armor-piercing bullets, there are usually one or two annular grooves between the head and the medicine chamber, so that when the head hits the target, the stress of breaking the head will be concentrated in the annular groove, and the rupture will not extend to the medicine chamber, which can maintain the explosive power to the greatest extent.

This kind of structural design concept derived from modern armor-piercing bullets, Iniex naturally did not hear of it, so he began to lower his head and think about this possibility, and after about half an hour, Lin Yuan said: "Okay, we can go over, but the carriage is from the villager's house, and the villagers have gone back to eat, so we have to walk." ”

Lin Yuan led everyone to the position of the target board, a distance of 1,200 meters, ten minutes was enough, but Lin Yuan took everyone to walk for half an hour, Lin Yuan said while walking: "Everyone walk slowly, the road here is not smooth." ”

When they arrived at the scene, there were a lot of falling pieces of iron scattered on the ground, so Inix pounced on them, looking for something among the irons, and after a long time, Inix took a few thin pieces of iron and walked in front of Lin Yuan.

Inix asked, "I want to borrow a few things from you, but I wonder if I can do it?" ”

Lin Yuan asked, "What do you want to borrow?" If we have it, I'll lend it to you. ”

"I need some sandpaper, a polisher, nitric acid, some wine, and the best microscope for me, and a well-ventilated room," Inix said. ”

Lin Yuan felt a burst of joy in his heart, thinking, "You can be regarded as taking the bait!" ”

It turns out that the purpose of Inix is to carry out metallographic microscopic analysis of these steels, metallographic is the internal form of the metal, and different heat treatment processes can produce different metallographies, for experienced experts, as long as they take a look at the metallographic diagram, what kind of heat treatment process is used for this metal, normalizing, quenching or annealing, at a glance, Iniex is to judge the strength of the steel used in the target plate.

However, Lin Yuan pretended to be embarrassed and said, "We have these things, but they are also bought with money......

Inix said: "Needless to say, how much, let's out!" ”

Lin Yuan said: "Ten thousand pounds." ”

Iniex casually signed a check from HSBC and handed it to Lin Yuan, who took it and put it away, and said with a smile: "We will prepare it for you." ”

Soon Lin Yuan led Iniex to an empty room, which contained a lot of tools for chemical experiments, and Inix immediately began to work, he first used sandpaper to finely polish a ** piece, and then put it on the polishing machine, because there was no electricity, so the polishing machine could only be manually powered, he found a person to shake the handle, so that the polishing disc rotated evenly, and Iniex carefully put the steel sheet on it to polish.

After washing with wine a few times, Iniex opened the window, then took a graduated cylinder, mixed the wine with nitric acid in a certain proportion, and then poured the mixture into the crucible for heating, lit the alcohol lamp, and the pungent smell of nitric acid suddenly wafted out of the crucible, but fortunately the wind outside the window blew in and blew these smells away.

Inix carefully put the steel sheet into nitric acid, after a while it was taken out, cleaned, and placed under the microscope, modern metallographic microscopic analysis is used, the magnification is very high, and the computer is connected, there is a special software for analysis, but the earliest metallographic analysis is indeed done under the microscope of low magnification.

Lin Yuan looked at Inix's focused appearance and thought: "This guy is also a top expert, the metallographic analysis technique of this era has just started, and he already knows how to judge the heat treatment process of steel from metallographic." ”

Iniex had already seen the vague metallographic structure at this time, and couldn't help but shake his head in surprise.