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研究了 Ｗ１８ Ｃｒ４ Ｖ 高速钢激光相变强化层的组织及其回火稳定性， 结果表明， 对于 Ｗ１８ Ｃｒ４ Ｖ 高速钢， 激光相变强化后的组织明显细化， 其组织由马氏体、残余奥氏体及未溶碳化物组成； Ｗ， Ｃｒ， Ｖ 等强碳化物形成元素在马氏体及残余奥氏体中固溶度的提高使强化层的回火稳定性有了明显的改善， 经６４０ ℃回火后强化层硬度达到最高值１００３ Ｈ Ｖ０ ．１ ， 红硬性的提高改善了高速钢刀具的切削性能
The microstructure and tempering stability of laser phase transformation strengthened layer of W18 Cr4V high speed steel were studied. The results show that the microstructure of W18 Cr4 V high speed steel after laser phase transformation strengthening is obviously refined. The microstructure of martensite, Austenite and undissolved carbides. The increase of solid solubility of martensite and retained austenite in the formation of strong carbides such as W, Cr, V and so on has obviously improved the tempering stability of the strengthening layer, Upon tempering at 640 ℃, the hardness of the strengthened layer reached the highest value of 1003 H V0. 1, the red hardness improved high-speed steel cutting tool cutting performance