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Analysis of the Causes of Magnetic Variation of Ferromagnetic Materials
It is known that materials can be classified into three categories based on their relative magnetic permeability (“r”): paramagnetic, diamagnetic, and ferromagnetic materials, and relative magnetic permeability of paramagnetic and diamagnetic materials. Similarly, ferromagnetic materials "have a large value. The bigger the ur, the bigger the magnetism. The material CrZMoV is a ferromagnetic material that fails to get stuck in the magnetic chuck. After we eliminate the possibility of mistakes in its materials, we will find two batches of exhaust valve seats that will be sucked and insufflated. A comparative test was conducted: from the two batches, three samples were drawn and chemical composition, hardness, and metallographic structure were examined. The inspection results are shown in the following table. Trial number on the electromagnetic chuck hardness of the chemical composition} metallurgical structure protection, 2 gas 3 months can not be sucked l normal HRC45, 49 martensite + block granular carbide + a large number of retained austenite 4 '. Protection, 6 cited energy Sucking! Normal HRC54, 58 martensite ten pieces of granular carbide + less disc retained austenite heat treatment method (excessive heating temperature and long holding time, etc.).
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