Effect of FW&TMCP treatment on wear resistance of as-cast high manganese steel frog

doi:10.13251/j.issn.0254-6051.2021.08.018

Abstract

Abstract: Casting high manganese steel is one of the widely used wear-resistant materials. However, due to casting defects such as shrinkage porosity, porosity, and coarse grains in cast high manganese steel, it has problems such as reduced mechanical properties and poor service stability. In order to reduce the defects of cast high manganese steel frog holes and refine the austenite grains, the effect of forge welding and thermomechanical heat treatment (FW&TMCP) on wear resistance of the cast high manganese steel frogs was studied. First, the conventional tensile properties of the cast high manganese steel and FW&TMCP high manganese steel were tested and then friction and wear test of the cast high manganese steel and FW&TMCP high manganese steel were carried out under different loads. The results show that the strength and plasticity of the FW&TMCP high manganese steel are much higher than that of the cast high manganese steel, and the strain hardening rate is also higher than that of the cast high manganese steel. The microstructure results show that the porosity of the FW&TMCP high manganese steel is reduced by 82%, and the density is increased greatly. The friction coefficient of the two high manganese steel decreases gradually with the increase of wear load. Under the same wear load, the friction coefficient of the cast high manganese steel is less than that of the FW&TMCP high manganese steel, and the FW&TMCP high manganese steel has less plastic deformation and higher wear resistance. The wear mechanism of the two high manganese steel changes from adhesive wear to abrasive wear with the increase of wear load.

Key words: as-cast high manganese steel, forging welding and thermomechanical treatment (FW&TMCP), strength, plasticity, wear resistance

CLC Number:

TG142.25

Lin Zhiqing, Zhang Fucheng, Ma Hua, Wang Lin, Chen Chen, Xu Ming. Effect of FW&TMCP treatment on wear resistance of as-cast high manganese steel frog[J]. Heat Treatment of Metals, 2021, 46(8): 92-98.

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