镍对09CuPCrNi耐候钢高温力学性能的影响

采用Gleeble 3000热模拟实验机测试和研究了CCT曲线以及镍含量对09CuPCrNi耐候钢(%:0.08C、0.34～0.35Cu、0.091～0.099P、0.53～0.55Cr、0.02～0.27Ni)的700～1 300℃塑性和抗拉强度的影响。结果表明,当钢中Ni含量由0.27%降至0.02%时,Ar₁、Ar₃分别由670.2℃和860.0℃升至710.0℃和882.5℃,并且贝氏体和马氏体相变也提前发生,800℃高温脆性温度区增宽,950℃高温脆性区消失。0.02%Ni耐候钢09CuPCrNi室温抗拉强度475～485 MPa,伸长率32%～34%,冲击功72～84 J,满足该耐候钢力学性能使用要求。

Effect of Nickel on Mechanical Properties of Weathering Steel 09CuPCrNi at High Temperature

CCT curves and effect of nickel content on ductility and tensile strength of weathering steel 09CuPCrNi (% ： 0. 08C, 0. 34 ~0. 35Cu, 0. 091 〜0. 099 P, 0. 53 〜0. 55 Cr, 0.02 ~0. 27Ni) at 700 〜1 300 ℃ have been measured and studied by using Gleeble 3000 thermal simulator. Results show that with decreasing Ni content to 0. 02% from 0. 27% , the Ar₁ and Ar₃ of steel increase respectively to 710. 1 °C and 882. 5 °C from 670. 2 °C and 860. 0 °C , and the bainite and martensite transformation occur earlier while the high temperature embrittlement zone at 800 °C is widen and that at 950 °C disappears. The tensile strength of 0. 02% Ni weathering steel 09CuPCrNi at ambient temperature is 475 ~485 MPa with elongation 32% ~34% and impact energy 72 ~ 84 J to meet the application requirement of the weathering steel.