摘要
为改进低镍奥氏体不锈钢的热轧工艺,利用热力模拟拉伸试验,研究了2种不同氮含量的连铸坯在不同温度下的热变形性能。结果表明,氮含量对低镍奥氏体钢热变形性能及组织有较大影响。当氮含量较高时,铸坯晶粒较细,在较小变形量下即可通过动态回复使材料软化,获得很好的高温塑性;而氮含量较低时,不易发生动态回复,只能在变形量足够大时才发生动态再结晶,高温塑性相对较差。
For improving hot rolling process of a low nickel austenitic stainless steel, the hot deformation properties of two continuous cast billets with different nitrogen additions were investigated by means of thermal-mechanical simulation experiments. Through the observation of microstructure after hot deformation,the behavior of the hot deformation was researched. The results show that the effects of nitrogen on hot deformation characteristics and structures of the low nickel austenitic stainless steel are significant. For the steel with more nitro gen additions,its prior austenite grains in the cast state are fine,the dynamic recovery is likely to take place after small hot deformation,so its hot ductility is better. For the steel with less nitrogen additions,the dynamic recovery does not easily take place,and the dynamic recrystallization takes place only after enough hot deforma tion,so its hot ductility of the tensile test is lower.
出处
《轧钢》
2008年第3期11-15,共5页
Steel Rolling
关键词
低镍奥氏体不锈钢
热变形
回复
再结晶
low nickel austenitic stainless steel
hot deformation
recovery
recrystallization
