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发表于 2013-1-5 13:13:55
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所以因为 发表于 2013-1-5 12:29
对的,轴承钢贝氏体是要经过等温才能得到的并且组织的形态也不象羽毛状,我只是觉得硬度这么高,说是屈氏 ...
总的来说还是马氏体多,屈氏体目测也就百分之二三十吧。
SKF的文献上,有关马氏体、贝氏体、珠光体、奥氏体,对硬度贡献的一个a rule of mixtures
The hardness of of 52100 type steels can be estimated using a rule of mixtures with the
assumption that the hardnesses of martensite, bainite, pearlite and austenite are given by
64, 35, 29 and 17HRC [217] 8 The method is likely to be reasonably accurate as long as the
steel does not contain much bainite because it is unreasonable to assign a single value of
35HRC to this phase since isothermal transformation to a fully bainitic structure at 250!C
following austenitisation at 840!C leads to a hardness close to 60HRC [218]. The concept
is inconsistent with the data presented in Fig. 19. On the other hand, transformation at
290!C leads to a hardness of between 38–39HRC [219]. |
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