高强度双相钢的高温力学性能  

High temperature mechanical properties of a high strength dual phase steel

作　　者：刘洋[1,2] 王征[1,2] 崔衡[1,2] 赵征志[1,2] 王洋[1,2] 杨鹤[1,2] 刘柏松[3] 青靓 

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]北京科技大学冶金工程研究院,北京100083 [3]首钢技术研究院,北京100043 [4]北京首钢股份公司,北京100043

出　　处：《材料热处理学报》2016年第5期133-137,共5页Transactions of Materials and Heat Treatment

基　　金：北京市青年英才计划(YETP0411)

摘　　要：利用Gleeble3500热模拟试验机对双相钢连铸坯的高温力学性能进行了研究,并通过Thermo-Calc热力学计算、差示扫描量热法（DSC）以及断口形貌与组织观察的方法,分析了其脆性区间产生的原因。研究表明,实验用钢的零强度温度（ZST）和零塑性温度（ZDT）分别为1450和1440℃,凝固前沿脆化温度区间较小,具有较好的抗高温裂纹特性。高温脆性区为1415~1440℃,其脆化的原因是晶界熔化,导致实验钢在应力作用下沿晶界开裂;低温脆性区为690~870℃,其脆化的原因是α-铁素体沿奥氏体晶界析出,导致实验钢在应力作用下沿晶界断裂。High temperature mechanical properties of the continuous casting slab of a dual phase steel were studied on a Gleeble 3500 thermal simulation testing machine,and embrittlement of the steel was analyzed by means of Thermo-Calc thermodynamic calculation,differential scanning calorimetry（ DSC）, fracture morphology and microstructure observation. The results show that zero strength temperature（ ZST） and zero plastic temperature（ ZDT） of the steel are 1450 and 1440 ℃,respectively,and the solidification front brittle temperature range is small,so that the steel has high resistance to high temperature cracking. High temperature brittle zone is from 1415 to 1440 ℃,and the brittle fracture is caused by grain boundary melting,which results in cracking along grain boundaries. The low temperature brittle zone is from 690 to 870 ℃,which is caused by the precipitation of alpha-ferrite along the austenite grain boundaries.

关 键 词：双相钢 高温力学性能 脆性温度区间 相变 

分 类 号：TG142.7[一般工业技术—材料科学与工程]