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通过改变高铬铸铁中的碳含量,而保持其它组分基本不变,得到M_7C_3型碳化物含量在9～42%之间的一系列合金.对每一种合金进行四种不同的热处理,从而使其具有四种不同的基体组织. 在ML-10磨料磨损试验机(二体磨损试验)和自制的自由磨料磨损试验机(三体磨损试验)上,用三种不同硬度的磨料(SiC、Al_2O_3和石榴子石)对这一系列合金进行磨损试验.并利用各种微观观察方法,分析和讨论了高铬铸铁中的两个主要组成相——(Cr,Fe)_7C_3型碳化物和基体在磨损过程中的作用,及其破损失效方式.结果指出:在不同的磨损系统中及在不同硬度的磨料下,合金组成相的破损是不同的,热处理状态强烈地影响了合金的耐磨性和组织破损形式,从而为在实际零件中选择高铬铸铁的成份和热处理提供了一定的依据.
A series of alloys with M_7C_3 type carbides between 9 and 42% were obtained by changing the carbon content of high chromium cast iron, leaving four different heat treatments for each of the alloys Which made it have four kinds of different matrix microstructure.Three kinds of abrasive with different hardness (SiC, Al 2 O 3 and garnet) were used to test the wear behavior of this series of alloys, and microscopic observation methods were used to analyze and discuss the relationship between the two main components, (Cr, Fe) _7C_3 carbides and matrix In the process of wear, and the way of failure failure.The results show that under different wear systems and under different hardness of abrasive, the alloy composition phase of the damage is different, heat treatment conditions strongly affect the wear resistance of the alloy And the form of tissue damage, which provides a basis for the selection of the composition and heat treatment of high-chromium cast iron in the actual parts.