Microstructural evolution of secondary carbides during spheroidized annealing and quenching and tempering in 60Cr16MoMA martensitic stainless steel

Shasha Qian; Huan Teng; Hongshan Zhao; Pengfei Hu; Tinghui Man; Han Dong

Journal of Materials Research and Technology (Jan 2024)

Microstructural evolution of secondary carbides during spheroidized annealing and quenching and tempering in 60Cr16MoMA martensitic stainless steel

Shasha Qian,
Huan Teng,
Hongshan Zhao,
Pengfei Hu,
Tinghui Man,
Han Dong

Affiliations

Shasha Qian: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China
Huan Teng: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China
Hongshan Zhao: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China; Zhejiang Institute of Advanced Materials, SHU, Zhejiang 314100, PR China; Corresponding author. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China.
Pengfei Hu: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China
Tinghui Man: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China; Zhejiang Institute of Advanced Materials, SHU, Zhejiang 314100, PR China; Corresponding author. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China.
Han Dong: School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China; Zhejiang Institute of Advanced Materials, SHU, Zhejiang 314100, PR China

Journal volume & issue: Vol. 28
pp. 3207 – 3216

Abstract

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The microstructural changes in secondary carbides during spheroidized annealing (SA) and quenching and tempering (QT) processes in 60Cr16MoMA martensitic stainless steel has been comprehensively studied. Using scanning electron microscope, X-ray diffraction, inductively coupled plasma-atomic emission spectrometry, and transmission electron microscopy, a substantial dissolution of submicron-sized M23C6 carbides after QT treatment was observed, leading to an increase in the mean carbides diameter. The highest solubility occurs at a 0.5 μm diameter, and carbide roundness improves during QT. Notably, the transformation of M7C3 carbides into M23C6 carbides was observed in QT samples through a multi-site in-situ nucleation mechanism. Additionally, it has been observed that Nb-rich MC carbides effectively restrict the growth of alloy carbides during heat treatment.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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