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通过冲击试验并利用透射电镜，扫描电镜和Ｘ射线衍射仪等测试设备研究了低中碳Ｓｉ－Ｍｎ－Ｖ钢回火马氏体脆性机理及稀土元素的作用，结果表明：回火碳化物的析出和粗化是导致试验钢回火马氏体脆性断裂的本质因素，回火马氏体脆性断裂方式强烈取决于钢中含碳量；稀土元素对试验钢回火马氏体脆性的影响与钢中含碳量有关．
The brittleness mechanism of rare-earth martensite and the effect of rare earth elements in low-carbon Si-Mn-V steel were studied by impact test and transmission electron microscopy, scanning electron microscopy and X-ray diffraction. The results show that the tempering carbides Precipitation and coarsening are the essential factors leading to the brittle fracture of tempered martensite in the test steel. The brittle fracture mode of tempered martensite strongly depends on the carbon content in the steel. The influence of rare earth elements on the tempered martensite brittleness Carbon content in steel.