0.05C-14Mn-19Cr-0.7N高氮奥氏体不锈钢电渣锭的高温塑性

试验0.05C-14Mn-19Cr-0.7N钢经1t非真空感应炉冶炼,并重熔成电渣锭。在电渣锭中心取样,通过Gleeble 3800热模拟试验机对试验钢进行800~1250℃,应变速率0.005~10s^-1的高温拉伸试验,得出温度和应变速率对试验钢断面收缩率的影响,并观察了各温度拉伸后的组织。试验结果表明,随着温度从800℃升高至1250℃,试验钢抗拉强度从327 MPa下降到68 MPa,断面收缩率由22%升至55%;1200℃时,应变速率从0.01s^-1增加到10s^-1时,试验钢的抗拉强度从43 MPa增加至109 MPa,断面收缩率从38%提高至71%。综合实验结果,高氮奥氏体不锈钢0.05C-14Mn-19Cr-0.7N最优的变形参数为:1200~1250℃,应变速率1~10s^-1。

Thermoplasticity of ESR Ingot of High Nitrogen Austenite Stainless Steel 0.05C-14Mn-19Cr-0.7N

The tested steel 0. 05C-14Mn-19Cr-0. 7N is melted by 1 t non vacuum induction furnace and remelted to ESR ingot. By sampling at center of ESR ingot and using Gleeble 3800 thermo-simulation testing machine the thenno tensile examination of tested steel at 800 ~ 1250 °C with strain rate 0. 005 ~ 10 s^-1 has been carried out to get the effect of temperature and strain rate on reduction of area of tested steel, and the structure of steel tensile-tested at each temperature is observed. Examination results show that with temperature increasing from 800 ℃ to 1 250 ℃ the tensile strength of tested steel decreases from 327 MPa to 68 MPa and the reduction of area of steel increases from 22% to 55% ；at 1200℃, with strain rate increasing from 0. 01 s^-1 to 10 s-1 the tensile strength of tested steel increases from 43 MPa to 109 MPa and the reduction of area of steel increases from 38% to 71%. Integrating the experimental results it is obtained that the optimized deformation parameters for high nitrogen austenite stainless steel 0. 05C-14Mn-19Cr-0.7N are rolling at 1200 ~ 1250°C with stain rate 1 ~ 10s^-1.