含钛微合金钢SAPH440高温热塑性研究  

Study of Hot Ductility of Ti Containing Steel SAPH440

作　　者：孙彦辉[1] 赵晓亮[1] 王龙岗[1] 蔡开科[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《连铸》2010年第2期4-8,共5页Continuous Casting

摘　　要：通过Gleeble 1500热模拟试验机对含钛微合金钢SAPH440的连铸坯在1400~600℃温度区间内的高温延塑性进行了测试,对试样的断口形貌及组织进行了观察。确定tL^1350℃之间为连铸坯的第I脆性区,950~725℃之间为连铸坯的第Ⅲ脆性区;第Ⅲ脆性区塑性降低主要是由连铸坯中Al N的析出和晶界网状铁素体的形成造成。提高连铸机顶弯或矫直温度大于950℃可以减少连铸坯表面裂纹的产生。Hot ductility of SAPH440 steel contained Ti CC slabs was measured with Gleeble 1500 hot tensile machine at temperature range of 1 400--600 ℃. The fracture appearance and microstructure were examined. The first zone of low ductility was found at range of tL --1 350 ℃, the third zone of low ductility was found at range of 950--725 ℃. Two main causes for the low ductility are precipitation of AIN and formation of network-shape ferrite at grain boundaries. Bending and straightening at over 950 ℃ are beneficial to reduce surface cracks.

关 键 词：含钛钢 连铸 高温力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]