Effect of heat treatment process on microstructure and abrasive wear properties of dredging engineering ship steel

doi:10.13251/j.issn.0254-6051.2022.01.006

Abstract

Abstract: In order to improve the wear resistance of low-carbon low-alloy wear-resistant steel for dredging engineering ships, three kinds of heat treatment processes of quenching-tempering at 200 ℃ (Q-T), quenching-partitioning at 250 ℃ (Q-P), and cyclic heat treatment (CR) were carried out respectively on the tested steel. The microstructure and precipitated phase were analyzed by scanning electron microscope (SEM) and transmission electron microscopy (TEM), the wear mass loss and the hardness were tested respectively by abrasive wear tester and hardness tester. The results show that after the quenching-tempering treatment, tempered martensite still with lath substructure and a small amount of carbides are obtained. Martensite and more retained austenite are obtained in the tested steel after quenching-partitioning. After cyclic heat treatment, the martensite laths in the tested steel disappear, and there are granular (Nb,Ti)C precipitates in the matrix. The hardness of the tested steel after quenching-tempering, quenching-partitioning and cyclic heat treatment is 39.5, 40.5, and 30.8 HRC, respectively, and the wear resistance of the tested steel is proportional to the hardness. The tested steel has the largest amount of wear mass loss and the worst wear resistance after cyclic heat treatment, while the tested steel has the second best wear resistance after quenched-tempering, and the tested steel has the best wear resistance after quenching-partitioning. For all the 3 groups of tested steel specimens, a large number of furrows appear on the surface of the specimens after abrasive wear, and the wear mechanism is mainly plastic deformation.

Key words: dredging engineering ship steel, cyclic heat treatment, quenching-partitioning, retained austenite, abrasive wear

CLC Number:

TG156.5

Gao Yaping, Shi Zhongran, Jia Juan, Luo Xiaobing, Song Xinli. Effect of heat treatment process on microstructure and abrasive wear properties of dredging engineering ship steel[J]. Heat Treatment of Metals, 2022, 47(1): 32-37.

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