Effect of Nb and Mo on microstructure and phase transformation of steel for mining grinding balls

doi:10.13251/j.issn.0254-6051.2022.08.008

Abstract

Abstract: Effect of Nb and Mo on microstructure and phase transformation of grinding ball steel with different alloy composition during heat treatment was studied by using high temperature confocal laser scanning microscope (HT-CLSM) and JMatPro simulation calculation. The results show that the average austenite grain size of the tested steel with 0.051%Nb is the smallest (38.8 μm), that without Nb or Mo addition is the largest (74.1 μm), and that with 0.079% Mo is the intermediate. With Nb element addition, the precipitates are mainly Nb(C, N) and MnS, and the amount of precipitates is the most, which significantly hinder the grain growth of high temperature austenite. While with Mo element addition, the precipitates are mainly MnS and AlN, and the amount of precipitates is the intermediate, which slightly hinder the grain growth of austenite. The addition of Nb and Mo is beneficial to expand the bainite transformation zone, increases the percentage of bainite transformation and increases the martensite transformation start temperature.

Key words: grinding ball steel, Nb, Mo, microstructure, phase transformation

CLC Number:

TG161

Xu Feng, Chen Qian, Lin Zhimin, Cheng Hao, Guan Yijie, Lu Kaijian. Effect of Nb and Mo on microstructure and phase transformation of steel for mining grinding balls[J]. Heat Treatment of Metals, 2022, 47(8): 52-57.

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