[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 6, pp.499-504

ISSN: 2508-5093 (Print) 2508-5107 (Online)

Print publication date 15 Dec 2018

Received 08 Oct 2018 Revised 23 Oct 2018 Accepted 26 Oct 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.6.499

SM53C 탄소강 자동차 부품 곡면부의 고주파 열처리 미세조직 및 경도 변화

이지성^a^{, b} ; 오민철^b ; 이세환^b^{, c} ; 전용호^d ; 안병민^b^{, *}

High Frequency Induction Heat Treated Microstructure and Hardness of a Curved Shaped SM53C Automotive Part

Jisung Lee^a^{, b} ; Min Chul Oh^b ; Se Hwan Lee^b^{, c} ; Yongho Jeon^d ; Byungmin Ahn^b^{, *}

aSeohan Engineering Research Institute, 49, Samsung 1-ro 5-gil, Hwaseong, Gyeonggi-do, 18449, Korea
bDepartment of Materials Science and Engineering and Department of Energy Systems Research, Ajou University, 206, Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Korea
cEhwa Diamond Industrial Co., Ltd., 374, Nambu-daero, Osan, Gyeonggi-do, 18145, Korea
dDepartment of Mechanical Engineering, Ajou University, 206, Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Korea

Correspondence to: ^*Tel.: +82-31-219-3531 Fax: +82-31-219-1613 E-mail address: byungmin@ajou.ac.kr (Byungmin Ahn).

Abstract

High-frequency induction hardening is one of the most commonly used heat treatment techniques for steel and by which enhanced surface hardness can be achieved for fatigue and wear resistance. During this process, a certain depth of products is rapidly heated and quenched so that the microstructure of the hardened surface is finer than those of the other parts of the product. In general, the hardening depth is more uniform in the straight surface than in the irregular-or complex-shaped surfaces because of the non-uniform heating and cooling rates in the irregular surfaces applied from the induction coils. This non-uniform hardening depth can cause unexpected deterioration of the fatigue properties. In this study, high-frequency induction hardening was applied to an SM53C steel automotive part having a 90° curved shape, and the microstructure and hardness variation in the curvature area were characterized in detail.

Keywords:

High frequency induction, Heat treatment, Carbon steel, Microstructure, Hardness, Electron backscatter diffraction

Acknowledgments

본 연구는 2015학년도 아주대학교 일반연구비 지원에 의하여 수행되었습니다.

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