Surface hardening by strain induced martensitic transformation
Surface hardening by strain induced martensitic transformation
复制标题
通过应变诱导马氏体转变进行表面硬化
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Dong
中科院分区：
文献类型：
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作者：
E. Brinksmeier;M. Garbrecht;D. Meyer;J. Dong
应变硬化所获得的硬度和疲劳强度通常明显低于热或热化学热处理。残余奥氏体形变或形变诱发马氏体相变可显著提高机械表面硬化的强度。本文提出了一种用亚稳奥氏体量较高的工件进行表层淬火的方法。显微组织必须足够稳定，以确保材料可以被加工，而不会因残余奥氏体应变诱导转变而改变。机械加工后，深轧引入高的赫兹接触应力，使残余奥氏体形变诱发马氏体相变。同时，深滚压也会产生零件的表面光洁度。通过这种方法，可以实现生产线内不需要热处理过程的表面硬化。这种方法的一个可以想象的用途是生产轴承或导轨。
The hardness and fatigue strength achieved by strain hardening are normally noticeable lower than those attained by thermal or thermochemical heat treatments. Strain or deformation induced martensitic transformation of residual austenite can increase the strength achieved by mechanical surface hardening processes considerably. In this paper, an approach is presented where workpieces with a high content of metastable austenite are used for hardening the surface layer. The microstructure has to be sufficiently stable, in order to ensure that the material can be machined without being changed by strain induced transformation of the residual austenite. After machining, high Hertzian contact stresses are introduced by deep rolling, so that a strain induced martensitic transformation of the residual austenite takes place. At the same time deep rolling produces the surface finish of the part. By this method, a surface hardening without a heat treatment process within the production line can be realized. A conceivable use of this method could be the production of bearings or guideways.