Analysis of grinding cracks on 4Cr13 steel spindle sleeve for gyratory crusher after laser quenching

doi:10.13251/j.issn.0254-6051.2022.05.045

Abstract

Abstract: Several cracks were found in the grinding stage of the 4Cr13 steel spindle sleeve for gyratory crusher after laser quenching, and having angles about 15° with the outer circle axis. Through macroscopic analysis, chemical composition analysis, hardness, effective hardened layer depth detection and microstructure observation, it is confirmed that the cracks of the 4Cr13 steel spindle sleeve are grinding crack. The cracks are mainly caused by the movement of tangential and axial directions in the grinding process of the grinding wheel. The tangential rotation speed is far greater than the axial moving speed. The resultant force of grinding tensile stress in the two directions results in an angle of about 15° between the crack and the axial direction. At the same time, the radial columnar crystal produced by laser melting reduces the bonding force between crystals. In addition, the residual temperature self-tempering method after laser quenching makes the stress distribution of hardened layer more complex, which makes it easy to crack in the grinding process.

Key words: 4Cr13 steel, spindle sleeve, microstructure, grinding crack

CLC Number:

TG142.1⁺4

Shi Ruxing, Lin Yichou, Zhang Pei, Qi Guosai, Yu Wenping, Su Wenbo. Analysis of grinding cracks on 4Cr13 steel spindle sleeve for gyratory crusher after laser quenching[J]. Heat Treatment of Metals, 2022, 47(5): 257-261.

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