Fracture failure analysis of 3Cr13 steel diesel cycle pump spindle

doi:10.13251/j.issn.0254-6051.2020.07.041

Abstract

Abstract: Fracture reason of the main shaft of diesel circulating pump of the 3Cr13 steel was analyzed by means of X-ray fluorescence spectrometer, metallographic microscope, brinell hardness tester, tensile testing machine, impact testing machine and scanning electron microscope etc. The results show that the chemical composition, hardness and mechanical properties of the 3Cr13 steel meet the technical requirements, and the impact energy is seriously low. Granular reticular carbide in the microstructure increases the brittleness of the material. The stress concentration is easily formed because of the lack of proper transition fillet at the right-angle transition of shaft diameter change step. The type of fracture belongs to fatigue fracture, and the stress concentration caused by the machining defects in the right-angle transition at the step where the shaft diameter changes is the main reason for the rapid fatigue fracture.

Key words: 3Cr13 steel, machining defects of spindle, fatigue fracture

CLC Number:

TG142.41

Zou Longjiang, Qi Lin, Shi Shuyan, Liu Shutan. Fracture failure analysis of 3Cr13 steel diesel cycle pump spindle[J]. Heat Treatment of Metals, 2020, 45(7): 202-205.

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