Cracking cause analysis of Cr12MoV steel cutting tool

doi:10.13251/j.issn.0254-6051.2020.10.047

Abstract

Abstract: Early cracking of a Cr12MoV steel cutting tool occurred during the period of service. The chemical composition, microstructure, hardness and fracture morphology of the Cr12MoV steel tool were investigated by means of direct reading spectrometer, metallographic microscope, Rockwell hardness tester, stereo microscope and scanning electron microscope (SEM). The results show that the main cause for the early cracking of the tool is the massive eutectic carbides with angled shape existed in the material, and another main cause is the unreasonable design of the screw hole concave platform which causes stress concentration.

Key words: Cr12MoV steel, cracking, eutectic carbide, stress concentration

CLC Number:

TG162.2

Wang Ning, Ding Beidou, Cui Meng , Feng Zhaoping. Cracking cause analysis of Cr12MoV steel cutting tool[J]. Heat Treatment of Metals, 2020, 45(10): 246-248.

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