Effect of tempering process on microstructure and mechanical properties of ZG30Mn cast steel

doi:10.13251/j.issn.0254-6051.2020.02.026

Abstract

Abstract:

The microstructure of tempered ZG30Mn cast steel under different tempering parameters was observed and analyzed by optical microscopy (OM). The mechanical properties of the steel were also tested, including tensile properties, Brinell hardness and impact properties. The results show that the microstructure of the steel treated by different tempering processes is mainly composed of tempered sorbite. When the holding time is 90 min, with the increase of the tempering temperature (580, 600, 620, 640 ℃), the hardness and strength gradually decrease, and the elongation and impact absorbed energy gradually increase. When the tempering temperature is 620 ℃, with the increase of tempering time(30, 60, 90, 120 min), the hardness and strength of the steel gradually decrease, while the elongation and impact absorbed energy increase first and then decrease. Tempering temperature plays a key role in the transformation process from martensite to sorbite. The increase of tempering temperature will affect the efficiency of recovery and recrystallization of α-Fe phase. The dispersed fine cementite gradually grows up and spheroidizes, resulting in the decrease of hardness and strength, and the increase of elongation and impact absorbed energy. Tempering holding time will determine the growth of cementite. With the increase of tempering time, the aggregation and growth of cementite will lead to the decrease of elongation and impact absorbed energy.

Key words: tempering process, ZG30Mn cast steel, microstructure, mechanical properties

CLC Number:

TG139.8

Tang Cai, Chen Bo, Fan Huiji. Effect of tempering process on microstructure and mechanical properties of ZG30Mn cast steel[J]. HTM, 2020, 45(2): 134-137.

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