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"The quenching marks are obvious and the martensite is intact. It is certain that the inner lock was inserted during the fire." I took a look and said.
"What did you say? What kind of body is the horse?" Ye Qian walked over with small steps.
"Yes, Brother Long, why haven't I heard of what you are talking about?" Guo Tao also asked curiously.
"This is just an academic title. You will understand when I say it, but it may not be true for some people!" I put my arm around Guo Tao's shoulders, pretending to avoid Ye Qian's explanation of the issue.
"Si Yuanlong, are you so stingy?" Ye Qian said, stamping her feet beside me.
Maybe it¡¯s because we had a rough idea of ??the scene and it wasn¡¯t a case, so I felt a lot better and opened my mouth to reply: ¡°I¡¯m just so stingy, what¡¯s wrong?¡±
"That piece of 'handmade chocolate' was just processed when I bought it. I originally wanted to give it to you as soon as I got back. How did I know that I forgot and it expired? At worst, I will give you another one later, what's the matter!" Ye Qian is a stubborn overlord. I usually want her to lower her profile and explain so many things to me, but there is no way. As the saying goes, one thing will bring down another, and only by holding her pigtails can she become so obedient.
"Come on, I don't remember the faults of villains, so I will explain to you the reason." As I said that, I separated the insert rod of the inner lock from the metal pin. Due to the fire, the paint on the surface of the lock has been damaged. Completely stripped down to the original metal color.
"Have you discovered anything?" I asked.
"There are two different colors on the locking rod!" Ye Qian said eagerly.
"Yes, this is the best proof. If you want to know why this happens, you must first explain another piece of knowledge to you."
"What knowledge?" Ye Qian became interested.
"Forging!" I said two words with great depth.
"Speak quickly."
I put the "L" shaped locking rod on the ground, then squatted down and explained: "We have all seen the scene in the movie where the swordsmith forges the sword."
"Yeah." Guo Tao and Ye Qian nodded in unison.
"The swordsmith first calcines the steel in the furnace, then hits it hard with a hammer. After the sword body is formed, he quickly puts the red-hot sword body into the prepared cold water to cool down, and finally polishes it. An ordinary sword is ready."
"Well, today's blacksmiths still use this method." Guo Tao added.
"Please note that what I just mentioned is just a general procedure. Swords also have qualities. A good sword can cut iron like mud and break hair. A bad sword can cut even wood. Why does the same forging procedure produce such a large amount of steel? difference?"
"Why?" Ye Qian asked, holding her chin with both hands, and Guo Tao listened attentively.
"This is the point I want to make. If you are careful enough, you will find that many sword-making masters in the movie spend their whole lives, and in the end they can only make a peerless sword. Although the expression in the movie is a bit exaggerated, this is not the case. It makes no sense. Let me tell you the real reason behind this."
¡°Brother Long, please stop being so secretive and ask for popular science!¡± Guo Tao said to me with admiration.
"Okay, then I will go directly to the point. The forged alloy sword body is calcined in the furnace fire. When the temperature is higher than 727 degrees, a stable 'austenite' structure will be formed on the alloy sword body," Austenite is non-magnetic. With this structure, the forged sword body will not absorb fine particles, thus ensuring purity. We all know that if the sword body is doped with too many impurities, it will easily break."
"'Austenite' has good plasticity and is the structure required for most steel types when pressure processing is performed at high temperatures. The swordsmith's beating of the red-hot sword body is actually a process of purification and shaping, which can only be repeated repeatedly Only by beating on the ground and continuously purifying can you get a pure sword body."
I took a breath and continued: "After the sword body is knocked out, the next step is to place it in a prepared liquid. This liquid is mostly alkaline water or salt water. Of course, white water will also work, but the effect will be worse. A little. We call this process quenching."
"During the quenching process, the rapidly cooled 'austenite' will form 'martensite'. 'Martensite' is actually the name of a structure of ferrous metal materials, which can greatly improve the strength and toughness of metals. The physical color is dark brown."
"If you repeat this process over and over again in the process of making a sword, you will definitely get a peerless sword in the end. Of course, I am talking about the entire process.The process of craftsmanship and the accumulated experience of the master swordsmith are also indispensable finishing touches. "I finished the above paragraph with great pride.
"Well, that makes sense, but what does this have to do with the case?" Ye Qian poured a basin of cold water over her.
"How come it doesn't matter? I've just been talking about it for a long time and you just took it as a joke?" I had some doubts about Ye Qian's IQ.
"Anyway, I don't understand. Do you understand?" Ye Qian turned to Guo Tao and asked.
"I understand a little bit," Guo Tao said shyly.
"I was defeated by you two. Didn't you just see it?" I pointed to the inner locking rod. "There is a clear difference in color between the extending part of the inserting rod and the inserting body. The color of the extending part is obviously lighter. When a fire breaks out, the door is held in place by a latch. When the temperature reaches a certain height, firefighters extinguish the fire with water, causing the temperature of the latch to drop instantly, which is the same as the quenching procedure for sword casting. The extended part of the latch is located in the latch. Although it has been exposed to high temperatures, it When extinguishing a fire, because the outer pin is not protected by water spray or is sprayed less, there is no quenching, so the black martensite structure is not formed, so the color is different. Isn't this color difference just the explanation? Was the inner lock inserted from the inside when the fire broke out? If this fire is a case, unless the suspect turns into a fly and flies out like Sun Wukong, he will definitely be burned to death inside."
"Oh! I understand!" Ye Qian suddenly understood and nodded.
"Xiaolong, come here and analyze the ignition point!" Brother Ming gave me a task. He has been engaged in criminal technology for so many years, and he is also my father's favorite disciple. Finding the ignition point at the fire scene is a simple matter. He could not fail to see that the purpose was very clear. He was testing me.
At the fire scene, the fire destroyed almost all the physical evidence. The fingerprints we are familiar with (composed of sweat, grease and other components) will evaporate under high temperatures and the grease will melt, so the fingerprints will not exist. Moreover, in 99% of fire scenes, fire officers and soldiers will be present to put out the fire, and the footprints will basically disappear under the impact of water pressure guns.
Without fingerprints and footprints, will the trace inspector be useless at the fire scene? In fact, it is not the case. Determining the ignition point is the most critical step.
"Fire point" is also called "fire point", which is easy to understand literally. It is the place where criminals choose to set fire or the fire first breaks out, and it is also the place where materials first burn. After judging this point, use it as the center of the circle to find relevant physical evidence or extract valuable test materials for testing.
For example, it may be more intuitive. If the case is arson, there may be combustion accelerants (alcohol, gasoline, etc.) left at the ignition point, and there may also be lighter wind caps, etc., which will affect the characterization of the entire case. great help.
¡°Then someone wants to ask, if the gasoline and everything else has been burned away, how can it still be found? In fact, everything is not absolute, because the gasoline molecules are very small and will quickly penetrate below the surface of the ground the moment the suspect dumps them. In this way, trace amounts of gasoline molecules can still be extracted. Of course, specific situations must be dealt with on a case-by-case basis.
The ground in this case was just dirt, not even a cement floor. Obviously, it is not difficult at all to extract combustion-supporting substances on this ground, at least for Lao Xian, it is a piece of cake.
Now that we know the special purpose of finding the ignition point, how do we find the ignition point in a pile of black waste? It's actually pretty simple once you know the ropes. When a general object burns, a large amount of black smoke will be emitted, which is actually some solid particles of soot (except for special chemicals). Gas will expand at high temperatures and generate thermal convection. Affected by the expansion of hot air flow, smoke particles float upward and eventually adhere to the top of the wall. Therefore, in general, the smoke above the ignition point at an indoor fire scene is thicker and burns most intensely. .
Through observation, I quickly found the ignition point of the scene.
"The fire point was directly above the body?" Brother Ming had just been reminiscing with Director Hu, and then he focused his attention on the darkened room.
"What's wrong, Brother Ming?" I asked with some confusion.
"This is contrary to common sense. If it is a suicide by setting fire, or an accidental fire causes death, the fire point will not be directly above the deceased, and there will usually be a deviation."
¡°You mean, someone directly put combustion-supporting materials on the corpse and then burned it?¡± I guessed what Brother Ming meant.
"It's very possible!" Brother Ming nodded.
"But the inner lock was locked when there was a fire. If it was arson, how did the suspect get out?" I was still complacent about my "sword-making theory" just now, but now it has been completely overturned by Brother Ming. doubt.
¡°It¡¯s not impossible to lock a latch lock like that from the outside, so it cannot be used as a basis for judgment.¡± Brother Ming flatly rejected my conclusion.
"Is it a case?" Ye Qian's eyes widened.
"No, this matter is not trivial. An autopsy must be done!" Brother Ming frowned.
The relaxed atmosphere between us just now gradually became tense.
"Director Hu, notify the police station to protect the scene. We will take the body to the funeral parlor." (Remember the website address: www.hlnovel.com)?Question.
¡°It¡¯s not impossible to lock a latch lock like that from the outside, so it cannot be used as a basis for judgment.¡± Brother Ming flatly rejected my conclusion.
"Is it a case?" Ye Qian's eyes widened.
"No, this matter is not trivial. An autopsy must be done!" Brother Ming frowned.
The relaxed atmosphere between us just now gradually became tense.
"Director Hu, notify the police station to protect the scene. We will take the body to the funeral parlor." (Remember the website address: www.hlnovel.com - Didn't finish reading? Add this book to your favoritesI'm a member and bookmarked this chapterCopy the address of this book and recommend it to your friends for pointsChapter error? Click here to report
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