Effect of heat treatment process on yield ratio of 34CrMo4 steel for high pressure gas cylinders

doi:10.13251/j.issn.0254-6051.2020.02.024

Abstract

Abstract:

In order to adress the higher yield ratio issue of 34CrMo4 steel for high pressure gas cylinders, effect of different heat treating processes including quenching and tempering (QT), quenching in 7.5% PAG aqueous quenchant and tempering (Q₁T), intercritical quenching and tempering (IT) and quenching plus intercritical quenching and tempering (QIT) on yield ratio of the 34CrMo4 steel were investigated, and the relationship between yield ratio and microstructure was also studied. The results show that after QT process, the microstructure of the tested steel consists of sorbite, and the yield ratio is highest. After Q₁T process, the microstructure of the tested steel consists of coarse sorbite, and the yield ratio is higher. After IT process, sorbite with polygonal and lath ferrite as second phase is obtained, and the yield ratio is lower. After QIT process, the microstructure consists of sorbite with even distributed lath ferrite as second phase, and the yield ratio is lowest. Based on the results, the specimen has lower yield ratio when there is a soft phase ferrite distributed on tempered sorbite.

Key words: 34CrMo4 steel, yield ratio, heat treatment, microstructure, intercritical quenching

CLC Number:

TG156

Zhang Yuyuan, Yang Gang, Fan Junming, Fan Guojin. Effect of heat treatment process on yield ratio of 34CrMo4 steel for high pressure gas cylinders[J]. HTM, 2020, 45(2): 125-128.

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