Nb微合金化17CrNiMo6钢齿轮轴的高温渗碳工艺  

High temperature carburizing process of Nb microalloyed 17CrNiMo6 steel gear shaft

作　　者：韩春阳 胡寒婷 张沛 赵学谦 王明飞 Han Chunyang;Hu Hanting;Zhang Pei;Zhao Xueqian;Wang Mingfei(Measurement and Testing Center,CITIC Heavy Industries Co.,Ltd.,Luoyang Henan 471000,China;Luoyang CITIC-HIC Casting and Forging Co.,Ltd.,Luoyang Henan 471000,China)

机构地区：[1]中信重工机械股份有限公司计量检测中心,河南洛阳471000 [2]洛阳中重铸锻有限责任公司,河南洛阳471000

出　　处：《金属热处理》2024年第11期267-272,共6页Heat Treatment of Metals

摘　　要：对17CrNiMo6钢进行Nb微合金化,研究其不同Nb添加量下的奥氏体晶粒度。并对Nb微合金化17CrNiMo6钢进行不同温度(910、930、940℃)的高温渗碳处理,对其有效硬化层深度和力学性能进行了研究。结果表明,经Nb微合金化后,17CrNiMo6钢的奥氏体晶粒细化效果显著,且随着Nb含量的增加,奥氏体晶粒等级增大,合适的Nb添加范围为0.03%~0.04%。与910℃高温渗碳相比,含0.032%Nb微合金化17CrNiMo6钢经930和940℃高温渗碳后,有效硬化层深度增加,渗碳速度分别提高8.3%~11.9%、13.3%~15.3%,但力学性能、晶粒度均无明显区别。因此,可通过适当提升渗碳温度加快微合金化17CrNiMo6钢的渗碳速度。Effect of Nb microalloying on the austenite grain size of the 17CrNiMo6 steel under different Nb addition was studied,and high temperature carburizing was carried out on the tested steel at different temperatures(910,930,940℃)by measuring the effective hardening layer depth and mechanical properties.The results show that the effect of Nb microalloying on the austenite grain refinement of the 17CrNiMo6 steel is significant,and the Nb content increases,the austenite grain grade increases,and the appropriate Nb addition range is 0.03%-0.04%.Compared with high temperature carburizing at 910℃,the effective hardening layer depth of the 17CrNiMo6 steel with 0.032%Nb is increased after high temperature carburizing at 930℃and 940℃,and the carburizing rate is increased by 8.3%-11.9%and 13.3%-15.3%,respectively.However,there is no significant difference in mechanical properties and grain size.The carburizing rate of the microalloyed 17CrNiMo6 steel can be accelerated by appropriately increasing the carburizing temperature.

关 键 词：17CrNiMo6齿轮钢 NB微合金化 高温渗碳 晶粒度 有效硬化层深度 

分 类 号：TG156.8[金属学及工艺—热处理]