退火工艺对30Cr15Mo1N钢组织和力学性能的影响

Effect of annealing process on microstructure and mechanical properties of 30Cr15Mo1N steel

对比研究了软化退火和球化退火工艺对热轧30Cr15Mo1N钢线材析出相特征,淬火、深冷、回火处理后微观组织和力学性能的影响。结果表明,退火后析出相为Cr_(2)(C,N)、M_(23)C_(6),球化退火试样析出相尺寸更细小,球化效果更好,分布更均匀,软化退火试样具有更高的强度,其抗拉强度为819 MPa,比球化退火试样高63 MPa,球化退火试样在拉伸过程中出现不连续屈服现象。软化退火试样中更多的析出相有效抑制了再加热过程中晶粒长大,使其在热处理后具有更细小的晶粒尺寸,硬度达到61.4 HRC,高于球化退火试样。

Effects of softening annealing and spheroidal annealing on the characteristics of precipitates,microstructure and mechanical properties of hot rolled 30Cr15Mo1N steel wire after quenching,cryogenic treatment and tempering were comparatively studied.The results show that precipitates after annealing are Cr_(2)(C,N)and M_(23)C_(6),where the spheroidal annealed specimen has a smaller size of precipitates,better spheroidizing effect,and more uniform distribution.The softening annealed specimen has higher strength,its tensile strength is 819 MPa,63 MPa higher than that of the spheroidal annealed specimen,and the spheroidal annealed specimen shows discontinuous yield phenomenon during tensile process.The more precipitates in the softening annealed specimen effectively inhibit grain growth during the reheating process,resulting in finer grain size after heat treatment,and the hardness is 61.4 HRC,which is higher than that of the spheroidal annealed specimen.