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利用Gleeble-1500D热模拟机对不同成分316奥氏体不锈钢分别在950、1000、1050、1100℃以0.05 s-1的应变速率下进行高温拉伸试验,通过分析试验曲线、断口形貌、变形区以及未变形区组织,研究增氮降镍对试验钢高温拉伸性能的影响。结果表明,增氮降镍使单位截面的杂质偏聚数量上升,恶化了试验钢的断口形貌,从而降低了钢材的热塑性,断面收缩率平均下降了37.5%;增氮降镍使钢材的抗拉强度平均提高了42.5%。
The high temperature tensile test was carried out on the austenitic stainless steel with different compositions at 950, 1000, 1050 and 1100 ℃ with a strain rate of 0.05 s-1 by using the Gleeble-1500D thermal simulator. The test curves, fracture morphology and deformation Zone and undeformed zone tissue, to study the effect of increasing nitrogen and reducing nickel on the tensile properties of high temperature. The results show that increasing the amount of nitrogen and increasing the number of impurity segregation per unit cross section increases, which deteriorates the fracture morphology of the test steel and reduces the thermoplasticity of the steel. The average reduction of area shrinkage is 37.5% Tensile strength increased by an average of 42.5%.