Crack defect analysis of 40CrMnMo steel drill pipe material

doi:10.13251/j.issn.0254-6051.2021.02.043

Abstract

Abstract: Failure analysis of the 40CrMnMo drill pipe material with cracks was carried out by means of OM, SEM and EDS. The results show that the microstructure of the specimen is tempered sorbite with fine and uniform grain size, and the inclusion grade is D0.5, the structure is in normal state. Cracks form during the quenching process, and thermal stress and microstructure transformation stress result in quenching cracking of the 40CrMnMo drill pipe material. Obvious oxidation phenomenon can be seen at the cracking location, no decarburization is observed, and secondary cracks appear as the cracks expand. After high temperature tempering, cracks continue to expand, and the tip of cracks continues to be oxidized. Based on the failure analysis, the cracking can be avoided by reducing the quenching temperature appropriately and stabilizing the properties of quenching oil.

Key words: trenchless drill pipe, 40CrMnMo steel, heat treatment, cracks

CLC Number:

TG172

Zhong Bin, Chen Yiqing, Meng Fanlei, Gao Peng, Ai Fangfang, Li Lin, San Hongyu. Crack defect analysis of 40CrMnMo steel drill pipe material[J]. Heat Treatment of Metals, 2021, 46(2): 228-231.

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