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探究稀土镧对FeCrAl不锈钢高温力学性能的影响。采用gleeble3500热应力/应变模拟机对添加0.052%La元素和不添加La元素FeCrAl不锈钢进行高温力学性能测试,运用金相显微镜和扫描电镜对试样拉伸后断口组织和形貌进行观察分析。结果表明:添加稀土镧可以提高FeCrAl不锈钢高温抗拉强度,并且消除FeCrAl不锈钢高温第三脆性区。分析断口形貌发现,高塑性区温度下的试样断口有明显韧窝,韧窝附近有较大塑性变形,断裂方式主要为穿晶断裂;低塑性区温度下的试样断口出现解理断裂,韧窝较浅,断裂方式主要为沿晶断裂。
The Effect of Rare Earth La on the High Temperature Mechanical Properties of FeCrAl Stainless Steel. The gleeble3500 thermal stress / strain simulator was used to test the mechanical properties of FeCrAl stainless steel with addition of 0.052% La and without addition of La. The microstructure and morphology of the fracture were observed by optical microscope and scanning electron microscope. The results show that adding rare earth lanthanum can increase the high temperature tensile strength of FeCrAl stainless steel and eliminate the third high temperature brittle zone of FeCrAl stainless steel. The analysis of the fracture surface shows that there are obvious dimples in the specimen fracture at high plastic zone temperature and large plastic deformation near the dimple. The fracture mode is mainly transgranular fracture; cleavage fracture occurs at the fracture surface of specimen at low plastic zone temperature , The dimples are shallower and the fracture mode is mainly intergranular fracture.