热处理工艺对H13芯棒钢组织和力学性能的影响  

The influence of the heat treatment procedure on the microstructure and mechanical properties of H13 mandrel steel

作　　者：胡平[1] 陆明和[1] HU Ping;LU Minghe(Research Institute,Baoshan Iron & Steel Co. ,Ltd. , Shanghai 201900, China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《宝钢技术》2018年第5期34-40,共7页Baosteel Technology

摘　　要：研究了H13芯棒钢在制造工艺过程中的组织演变规律和预备热处理工艺、二次回火温度对其组织和力学性能的影响。研究结果表明,采用宝钢出厂退火态的H13芯棒坯材料,调质前采用文中的正火或球化或正火+球化三种工艺进行预备热处理对最终调质后的力学性能无显著影响,直接调质的H13芯棒钢的各项力学性能指标可以满足设计要求;在600~680℃范围内,随着二次回火温度的升高,材料强度逐渐下降,但塑性、韧性逐渐改善。在1 030℃/保温1 h/油淬+600℃/保温5 h/空冷的淬火+一次回火的工艺条件下,二次回火温度选择650℃可以获得良好的强韧性匹配;二次回火保温时间对性能也有显著影响,二次回火保温时间从1 h增加至2 h,H13芯棒钢的硬度值降低,且随着二次回火温度的升高,该降低幅度逐渐增大;在1 030~1 090℃,随着淬火加热温度的升高,H13芯棒钢的屈服强度、抗拉强度和硬度逐渐增加,但冲击韧性有所降低。The microstructure evolution during the whole manufacturing process and the influence of preheat treatment procedure and the second tempering temperature on the microstructure and mechanical properties of H13 mandrel steel were investigated.The experiment results showed that using the H13 mandrel steel billet under as-annealed condition produced by Baosteel company as the raw material,the preheat treatment of normalizing or spheroidizing annealing or normalizing plus spheroidizing annealing mentioned and specified had no significant effect on the final mechanical properties after quenching and tempering.H13 mandrel steel could meet all the mechanical properties requirement by quenching and tempering without preheat treatment.In the rang from 600℃to 680℃,with the second tempering temperature increasing,the strength gradually decreased while the plasticity and toughness gradually improved.Under the quenching plus first tempering procedure of 1 030℃/1 h/oil cooling+600℃/5 h/air cooling,good balance between strength and toughness could be achieved by selecting 650℃as the second tempering temperature.It is also showed that the holding time of the second tempering played a big role in the mechanical properties.When this holding time extended from 1 h to 2 h,the hardness of the H13 mandrel steel dropped and the extent of reduction raised with the increase in the second tempering temperature.In the range from 1 030℃to 1 090℃,the yield strength,tensile strength and hardness gradually increased,however,the impact toughness decreased with the increase in the quenching temperature.

关 键 词：H13 芯棒钢 热处理 组织 力学性能 

分 类 号：TG162[金属学及工艺—热处理]