Failure cause analysis of crankshaft blank in cold straightening process

doi:10.13251/j.issn.0254-6051.2020.07.046

Abstract

Abstract: A 45 steel crankshaft blank fractured in the cold straightening process to eliminate the slight deformation after forging.The spectrometer, Brinell hardness tester, metallographic microscope, tensile testing machine, scanning electron microscope and so forth were used to analyze the chemical composition, mechanical properties, microstructure, and fracture morphology characteristics of the fractured blank. The results show that the matrix structure near the fracture is coarse, and the Widmannstatten microstructure appears; the mechanical properties such as plasticity and impact toughness are low, which indicates the microstructure is overheated. This is the direct cause of brittle fracture of the forged billet. By adjusting the induction heating parameters in pre-forging process, the post-forging controlled cooling process and the normalizing process, the overheating structure is eliminated.

Key words: failure analysis, overheating, normalizing, grain size, forging blank

CLC Number:

TG115.21

Cong Jianchen, Yu Xiaodong, Ma Mingzhu, Wu Yongchen, Zhang Huadong. Failure cause analysis of crankshaft blank in cold straightening process[J]. Heat Treatment of Metals, 2020, 45(7): 224-227.

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