微量硼对低碳贝氏体钢过冷奥氏体转变的影响  

Effect of Minor Boron on Undercooled Austenite Transformation in Low Carbon Bainite Steel

作　　者：曹忠孝[1] 李文斌[1] 庞兆夫[1] 李桂艳[1] 李阳[1] 

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《鞍钢技术》2009年第1期22-24,共3页Angang Technology

摘　　要：采用Gleeble-3800热模拟实验机对加入微量硼的低碳钢进行了动态CCT曲线的测定和组织分析,研究了钢中微量硼在奥氏体晶界上的偏聚作用。结果表明,微量硼的加入降低了碳原子在晶界上的吸附趋势,导致了晶界处珠光体形核率的下降,改变了动态CCT曲线的形状,抑制了珠光体的转变,能明显提高钢的淬透性和强韧性。Adopting thermal simulation test machine Gleeble -3800, the dymanic CCT diagram of low carbon steel after adding minor boron is determined and the microstructure of which is analysed, then the segregation of minor boron at austenite grain boundary in steel is researched. The results indicate that at austenite grain boundary, the adsorption tendancy of carbon atoms is reduced, pearlite nucleation rate is dropped, the shape of CCT diagram is changed, the pearlite transition is restrained and the hardenability and ohdurabihty of the steel are obviously improved.

关 键 词：硼 过冷奥氏体 动态CCT曲线 相变 淬透性 

分 类 号：TG115[金属学及工艺—物理冶金]