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为改善高碳钢95CrMo的强度和塑性,提高中空钢钎杆在使用中的寿命,通过设计热加工试验研究了控轧控冷工艺对95CrMo钢微观组织和强塑性的影响。试验结果表明,对于空冷状态的95CrMo钢,终轧温度的提高促进了奥氏体再结晶,减少了二次渗碳体量,使其断续分布,提高了试验钢的塑性。因此,空冷试验钢在870℃和900℃终轧时取得了良好的强塑性匹配。在喷雾冷却中,与相同终轧温度空冷钢相比,喷雾冷却使二次渗碳体量增加,但是珠光体片层间距减小,同时降低终冷温度可减少渗碳体量,使试验钢在870℃终轧650℃终冷的条件下得到较好的强塑性匹配。
In order to improve the strength and ductility of high carbon steel 95CrMo and improve the service life of hollow steel rod, the effect of controlled rolling and controlled cooling process on the microstructure and plasticity of 95CrMo steel was studied through the design of hot working test. The experimental results show that for the air cooled 95CrMo steel, the increase of the finish rolling temperature promotes austenite recrystallization, reduces the volume of secondary cementite, makes it intermittent distribution, and improves the plasticity of the test steel. Therefore, the air-cooled test steel at 870 ℃ and 900 ℃ finishing achieved good strong plastic matching. In the spray cooling, compared with the same finishing temperature air-cooled steel, spray cooling increased the amount of secondary cementite, but the pearlite sheet spacing decreased, while reducing the final cooling temperature can reduce the amount of cementite, the test steel In the final finish rolling 870 ℃ 650 ℃ under the conditions of the final cold plastic get better match.