Effect of tempering on microstructure and hardness of thick gauge NM450 wear-resistant steel slab

doi:10.13251/j.issn.0254-6051.2020.01.023

Abstract

Abstract: The microstructure and hardness of NM450 wear-resistant steel at different tempering temperatures (200, 250, 300, and 350 ℃) and duration (160, 190, 220, and 250 min) were studied by using optical microscope (OM), scanning electron microscope (SEM) and Vickers hardness tester. The results show that the hardness of the steel plate fluctuates greatly in the thickness direction, and the hardness is significantly higher in the segregation zone than in other locations. Tempering temperature has a very significant impact on the hardness of the NM450 steel. After tempering, the hardness of NM450 steel decreases, especially in the segregation zone. With the increase of tempering and holding time, the hardness of the NM450 steel does not decrease remarkably.

Key words: NM450 wear-resistant steel, tempering, hardness, segregation

CLC Number:

TG156.5

Jiang Jinxing, Dong Junyuan, Wang Huihui, Wu Xiang, Zhao Weiwei, Zuo Xiurong. Effect of tempering on microstructure and hardness of thick gauge NM450 wear-resistant steel slab[J]. HTM, 2020, 45(1): 117-121.

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