Effect of Heat Treatment on Microstructure and Mechanical Properties of High-Strength Steel for in Hot Forging Products

Metals

卷:11

JongBae Jeon¹  Moonseok Kang²  HyoungChan Kim²  Byoungkoo Kim²  ByungJun Kim²  Minha Park²  Hyunmyung Kim³  HeeSang Park⁴  ChangYong Choi⁴  Se-Hun Kwon⁵ 

[1] Department of Materials Science and Engineering, Dong-A University, Busan 49315, Korea;

[2] Dongnam Regional Division, Korea Institute of Industrial Technology, Busan 46938, Korea;

[3] Materials Safety Technology Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea;

[4] Research Center, Felix Technology Co., Ltd., Busan 46733, Korea;

[5] School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea;

关键词: high-strength steel;    hot forging;    heat treatment;    microstructure analysis;    phase analysis;   

DOI  :  10.3390/met11050768

来源: DOAJ

【 摘 要 】

High-strength steel is widely used in hot forging products for application to the oil and gas industry because it has good mechanical properties under severe environment. In order to apply to the extreme environment industry requiring high temperature and high pressure, heat treatments such as austenitizing, quenching and tempering are required. The microstructure of high-strength steel after heat treatment has various microstructures such as Granular Bainite (GB), Acicular Ferrite (AF), Bainitic Ferrite (BF), and Martensite (M) depending on the heat treatment conditions and cooling rate. Especially in large forged products, the difference in microstructure occurs due to the difference in the forging ratio depending on the location and the temperature gradient according to the thickness during post-heat treatment. Therefore, this study attempted to quantitatively analyze various phases of F70 high-strength steel according to the austenitizing temperature and hot forging ratio using the existing EBSD analysis method. In addition, the correlation between microstructure and mechanical properties was investigated through various phase analysis and fracture behavior of high-strength steel. We found that various microstructures of strength steel depend on the austenitizing temperature and hot forging ratio, and influence the mechanical properties and fracture behavior.

【 授权许可】

Unknown