增氮降镍对316奥氏体不锈钢高温拉伸性能的影响

Effect of increasing nitrogen and reducing nickel on high temperature tensile properties of 316 austenitic stainless steel

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%。

High temperature tensile test of 316 austenitic stainless steel for different components with strain rate 0. 05 s^-1 at 950、1000、1050、1100 ℃ was conducted by using Gleeble-1500 D thermal simulator. The effect of increasing nitrogen and reducing nickel on high temperature tensile properties of the tested steels was investigated by analyzing the experimental curve,fracture morphologies,the microstructure in deformation zone and without deformation zone. The results show that increasing nitrogen and reducing nickel makes the impurities aggregation per unit area increase,deterioration of the fracture surface morphology of the tested steels. Therefore the thermoplastic of the steel reduces,and the reduction of area decreases by an average of 37. 5%. Also the tensile strength increases by 42. 5%.