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 3500thermal 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.
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