Nb微合金化低碳贝氏体圆钢的组织细化  

Microstructure refinement of niobium microalloyed low carbon bainitic bar steel

作　　者：易敏[1,2] 王国栋[1] 陈涛[2] 王立峰[2] 佟倩[2] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳辽宁110004 [2]首钢总公司技术研究院,北京100043

出　　处：《金属热处理》2012年第8期68-72,共5页Heat Treatment of Metals

摘　　要：通过热模拟试验研究了Nb微合金化在长材低碳贝氏体钢中的作用机理。研究表明对该成分的低碳贝氏体钢采用线棒材轧制时,形变诱导析出Nb(CN)抑制再结晶主要发生在轧后过程中,抑制了轧后相变前的奥氏体晶粒长大,同时抑制了贝氏体板条束的长大。变形后在空冷条件下,3 s后开始发生明显的析出,在900℃以下变形,在贝氏体相变前,可获得约10μm的均匀细小的奥氏体晶粒。Mechanism of Nb-microalloying for microstructure refinement of low carbon bainitic steel was studied by thermal-simulation test. The results show that for low carbon bainitic steel with this kind of composition, during the process of wire-rod rolling, recrystallization inhibited by deformation-induced precipitation of Nb （C, N） mainly occurs after rolling, and the deformation-induced precipitation of Nb（ C, N） can effectively restrain austenitic grain growth and lath bainite growth. Under air-cooling conditions after hot deformation, the precipitation is obvious after 3 s, fine austenite grains about 10μm can be obtained when the steel is deformed below 900℃ before bainite transformation.

关 键 词：Nb微合金 低碳贝氏体钢 热变形 应变诱导析出 再结晶 

分 类 号：TG142.4[一般工业技术—材料科学与工程]