Effect of induction heating process on low temperature toughness of large size bulb flat steel

doi:10.13251/j.issn.0254-6051.2024.10.007

Abstract

Abstract: Effects of different heat treatment processes on mechanical properties and microstructure of large size bulb flat steel were researched by means of OM, SEM, EBSD, TEM and other methods. The results show that compared with the hot rolling and tempering process, the impact absorbed energy at -40 ℃ at ball head center of the bulb flat steel after induction quenching and tempering process is increased by about 112 J, the crack propagation work is increased by about 125 J, the dynamic tearing energy and the fracture fiber ratio are significantly increased, and the ductile-brittle transition temperature is reduced from about 10 ℃ to below -60 ℃. After induction quenching and tempering process, the microstructure at ball head center of the bulb flat steel is ferrite+martensite+bainite, of which average grain size is significantly refined compared with the hot rolling and tempering process, and the number of carbides is more and the size is smaller. After hot rolling and tempering process, the microcracks on impact fracture are formed at the carbides on the pearlite and ferrite grain boundaries, while after induction quenching and tempering process, the impact fracture are characterized by ductile fracture with obvious dimples. Compared with the hot rolling and tempering process, the induction quenching and tempering process greatly improves the low temperature toughness of the large size bulb flat steel.

Key words: large size bulb flat steel, induction quenching, low-temperature toughness, grain size, microstructure

CLC Number:

TG142.1

Liang Fengrui, Su Hang, Chai Feng, Luo Xiaobing, Shi Zhongran, Zhou Naipeng, Qi Zhen. Effect of induction heating process on low temperature toughness of large size bulb flat steel[J]. Heat Treatment of Metals, 2024, 49(10): 43-51.

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