Abstract:  Hereditary feature of original coarse grain of steel OOCrl INil IMoTi rolled at 1 150 °C and solid-solution treated at 780 ~900 °C has been studied. Results show that there is a critical temperature Ac for the steel, at which the austenite renews nucleation and the heredity of coarse grain do not carried out; the Ac of steel OOCrllNillMoTi is 870 ~ 900 °C and higher than transformation point A_f, and with heating at A_f ~ Ac, the heredity of original coarse grain occurs. With pre-heat-treating in two-phase region As (630 °C) - A_f( 730 °C ) , the critical temperature Ac to renew nucleation of austenite decreases, but it is not available to refine grain with pre-heat-treating at temperature higher than Ac.

摘要： 研究了00Cr11Ni11MoTi钢1150℃轧后原始粗大晶粒在780～900℃固溶处理的遗传特征。结果表明,该钢存在一个奥氏体重新形核、不再遗传粗大晶粒的临界温度(Ac),00Cr11Ni11MoTi钢Ac在870～900℃,远高于A_f相变点,在A_f～Ac加热均发生原始粗大晶粒遗传。As(630℃)～A_f(730℃)两相区预处理可使奥氏体重新形核的临界温度(Ac)降低,但在Ac温度以上这种预处理没有明显的晶粒细化作用。

关键词: 超高强不锈钢, 晶粒遗传, 临界温度, 循环处理