Effect of high temperature delay quenching processes on properties of medium carbon niobium microalloyed steel

doi:10.13251/j.issn.0254-6051.2020.01.004

Abstract

Abstract: A medium carbon microalloyed steel containing 0.044% niobium (mass fraction) was studied through orthogonal experiments, and the effect of high temperature delay quenching processes on its microstructure, hardness, strength, plasticity and toughness was analyzed. The results show that the hardness of the steel is higher under high temperature delay quenching than that under normal quenching process. Under the experimental conditions, with the increase of the precooling temperature and the shortening of the tempering time, the strength of the steel is improved. Conversely, the plasticity and toughness are improved. The process to obtain the optimum strength is delay quenching at 1000 ℃ and tempering at 200 ℃ for 1 h. The process to obtain the best plasticity and toughness is delay quenching at 900 ℃ and tempering at 600 ℃ for 3 h, the corresponding percentage reduction of area is 53.8%, the percentage elongation after fracture is 15.1%, and the impact absorbed energy is 96 J.

Key words: medium carbon niobium microalloyed steel, delay quenching, orthogonal experiment, mechanical properties

CLC Number:

TG142.1

Xue Weihua, Lian Yapeng, Wei Hailian, Mao Yunlong, Shi Yingwei, Wang Hao. Effect of high temperature delay quenching processes on properties of medium carbon niobium microalloyed steel[J]. HTM, 2020, 45(1): 16-19.

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