Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization

doi:10.13251/j.issn.0254-6051.2022.06.047

Abstract

Abstract: Reasons for abnormal microstructure of quenched and tempered G12MnMo7-4 steel castings were analyzed by means of optical microscope (OM), scanning electron microscope (SEM), universal testing machine and micro Vickers hardness tester. And the quenching and tempering process was optimized. The results show that G12MnMo7-4 steel is a low-carbon alloy steel, due to high quenching temperature, overheating abnormal structure appears in some parts. After treated by improved quenching and tempering process (870 ℃×3 h rapid quenching+580 ℃×3 h tempering), the microstructure is fine tempered sorbite with good comprehensive properties, which meets the requirements of product technical conditions.

Key words: G12MnMo7-4 steel, abnormal structure, quenching and tempering, tempered sorbite

CLC Number:

Chang Youyu, Song Zhongming, Li Fuyan, Gou Chunlin. Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization[J]. Heat Treatment of Metals, 2022, 47(6): 266-269.

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Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization

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