Effect of Nb microalloying on microstructure and properties of Cr-Ni-Mo carburized gear steel

doi:10.13251/j.issn.0254-6051.2021.01.022

Abstract

Abstract: Effect of Nb on microstructure and properties of Cr-Ni-Mo alloyed gear steel under different carburizing processes was investigated.The results show that Nb element has little influence on surface hardness,retained austenite content and non-martensite microstructure in the carburizing layer under different carburizing processes.However,the test steel with Nb element refining grain can make the effective hardening depth deepen by 10% and obtain a finer surface lamellar structure of lath martensite after a longer carburizing process.

Key words: microalloying, Nb element, carburizing heat treatment, microstructure, properties

CLC Number:

142.1

Gui Weimin, Liu Yi, Zhou Genshu, He Liangliang, Wang Mengmeng, Tang Wenxin. Effect of Nb microalloying on microstructure and properties of Cr-Ni-Mo carburized gear steel[J]. Heat Treatment of Metals, 2021, 46(1): 114-119.

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