Cause analysis of abnormal microstructure of nodular cast iron parts after high frequency induction quenching

doi:10.13251/j.issn.0254-6051.2021.06.045

Abstract

Abstract: Low spheroidization rate and excessive ferrite content was detected in the high frequency induction hardening area of a ductile ironplane carrier riser after induction hardening. Through comparative analysis of microstructure and experiments, the results show that the abnormal graphite morphology in high frequency induction hardening area is related to the defect of nodular at the riser and relatively slow cooling rate. The ferrite content in high frequency induction hardening area after casting is too high, and the normalizing after casting does not effectively improve this phenomenon, which leads to the excessive ferrite content. The qualified part can be obtained by optimizing casting process, normalizing after casting and high frequency induction hardening.

Key words: high frequency induction hardening, abnormal microstructure, riser, cooling rate, austenite transformation

CLC Number:

TG156.31

Wang Lei, Ma Lu, Yang Bo, Zhang Kai, Song Yang, Wang Ye. Cause analysis of abnormal microstructure of nodular cast iron parts after high frequency induction quenching[J]. Heat Treatment of Metals, 2021, 46(6): 231-235.

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