Effect of carbon content and cooling rate on quenching residual stress of steel parts

doi:10.13251/j.issn.0254-6051.2022.06.036

Abstract

Abstract: Relationship between surface residual stress and carbon content as well as the cooling rate of SAE8620, SAE8625 and SAE8627 steel bars with diameter of ø12 mm and the length of 50 mm after quenching was studied. The results show that the residual stress is compressive stress and the value is about 200-600 MPa. The value of compressive stress decreases with the increase of carbon content and the cooling rate,while the relationship between compressive stress value and core hardness is just the opposite. The higher the cooling rate is, the smaller the residual compressive stress is for the same core hardness of the same carbon content test piece. Thus, adopting lower cooling rate is beneficial to increase the residual compressive stress on the surface.

Key words: carbon content, cooling rate, microstructure, hardness, residual stress

CLC Number:

TG142.1⁺5

Li Yang, Zhang Jianwei, Zhu Pengkai, Yang Yang. Effect of carbon content and cooling rate on quenching residual stress of steel parts[J]. Heat Treatment of Metals, 2022, 47(6): 192-195.

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