镍对09CuPCrNi耐候钢高温力学性能的影响

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

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,Ar_1、Ar_3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。

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. 099P, 0. 53 -0. 55Cr, 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 ℃ and 882. 5 ℃ from 670. 2℃ and 860. 0 ℃, and the bainite and martensite transformation occur earlier, while the high temperature embrittlement zone at 800 ℃ is widen and that at 950 ℃ 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.