Effect of tempering temperature on microstructure and properties of NM500 wear-resistant steel

doi:10.13251/j.issn.0254-6051.2022.10.025

Abstract

Abstract: Effect of tempering temperature on microstructure, mechanical properties and wear resistance of NM500 low alloy high strength wear-resistant steel was studied by means of optical microscope (OM), scanning electron microscope (SEM) and material surface comprehensive performance tester. The results show that the typical tempered martensite structure is obtained in the NM500 steel after quenching and tempering. With the increase of tempering temperature, supersaturated carbon atoms in martensite laths are gradually precipitated, the hardness and low temperature impact absorbed energy of the NM500 steel decrease obviously after the carbides grow up. The hardness and impact absorbed energy at -20 ℃ of the NM500 steel after tempering at 200 ℃ are 513 HBW and 44.40 J, respectively, and the wear resistance is the best. When tempering at low temperature(200 and 250 ℃), a small amount of fine dispersed supersaturated carbon atoms precipitate, which improves the wear resistance of the steel. When tempering at 300 ℃ and above, the aggregated coarsened short rod cementite will reduce the hardness of the matrix, resulting in a continuous decrease in the wear resistance of the steel. The wear mechanism changes from abrasive wear to adhesive wear.

Key words: NM500 wear-resistant steel, tempering temperature, microstructure, mechanical properties, dry friction property

CLC Number:

TG161

Zhu Zhenyu, Wu Zhifang, Wu Run. Effect of tempering temperature on microstructure and properties of NM500 wear-resistant steel[J]. Heat Treatment of Metals, 2022, 47(10): 154-159.

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