热变形参数对超低碳贝氏体钢显微组织的影响  

Effect of Thermal Deformation Parameters on Microstructure of ULCB Steel

作　　者：王中学[1] 王慧玉 张思勋[1] 韩文习[1] 刘春明[3] 

机构地区：[1]莱芜钢铁集团有限公司技术研发中心,山东莱芜271104 [2]莱芜钢铁股份有限公司棒材厂,山东莱芜271106 [3]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004

出　　处：《山东冶金》2008年第5期46-48,53,共4页Shandong Metallurgy

摘　　要：采用弛豫-析出-控制相变(RPC)工艺,对超低碳贝氏体(ULCB)实验钢进行了不同变形温度、不同弛豫时间、不同变形速率的热模拟试验。利用金相显微镜、SEM、TEM对钢的显微组织进行观察,分析热变形参数对钢显微组织的影响,研究发现:在800～850℃之间变形且弛豫50s后的ULCB钢能够获得约0.5μm宽板条贝氏体组织,其上有大量的高密度位错缠结与Nb(CN)粒子析出。变形速率对ULCB钢的微观组织影响不大。According to Relaxation-Precipitation Controlling phase transformation （RPC） techniques, the thermal simulation experiment of ULCB steel was tested at different deformation temperature, relaxation time and deformation rate and the microstructure of the steel was observed by microscope, SE and TEM for analyzing the influence of deformation parameters on The test results showed that with deforming temperature of 800-850 ~C and relaxation time of 50 s, lath bainite about 0.5 μm width with a large number of tangled high density dislocations and precipitated Nb（CN） particle could be obtained in ULCB steel, and the rate of deformation had a little influence on the microstructure of the steel.

关 键 词：ULCB钢 热模拟 变形温度 弛豫时间 变形速率 显微组织 

分 类 号：TG113.12[金属学及工艺—物理冶金]