淬透性细化分级8620H钢的热处理性能研究

Heat treatment properties of 8620H steel with refined graded hardenability

通过对化学成分的微调实现8620H钢种的低、高淬透性分级,并研究其在副箱中间轴上的应用。结果可知,在相同的热处理工艺下,相较于低淬透性8620H钢副箱中间轴,高淬透性8620H2钢具有更深的有效硬化层深度和更高的心部硬度。此外,低淬透性8620H钢副箱中间轴的热处理工位节拍时间为25.5 min,而高淬透性8620H2钢工位节拍时间可缩短至20.5 min。但是,需要注意的是,在开发8620H2钢高淬透性零件的热处理工艺时,应综合考虑热处理的技术指标和热处理后的齿部精度。

8620 H steels with low hardenability and high hardenability were prepared by modifying chemical composition,and application on the intermediate shaft of the auxiliary box was studied.The results show that under the same heat treatment process,the high hardenability 8620 H2 steel has a deeper effective hardened layer depth and higher core hardness than that of the low hardenability 8620 H steel auxiliary box intermediate shaft.In addition,the heat treatment work station take time of the low hardenability 8620 H steel auxiliary box intermediate shaft is 25.5 min,while that of the high hardenability 8620 H2 steel can be significantly decreased to 20.5 min.It should be noted that,when developing the heat treatment process for the part of the 8620 H2 steel with high hardenability,the technical indexes of heat treatment and the accuracy of tooth after heat treatment should be comprehensively considered.