Effects of quenching process and Nb addition on prior austenite grain size of 30MnB5 steel

doi:10.13251/j.issn.0254-6051.2020.12.042

Abstract

Abstract: Effects of quenching processes and Nb addition on prior austenite grain size of 30MnB5 steel were studied by means of optical microscope (OM). The results show that the prior austenite grain size of 30MnB5 steel containing Nb is stable when the quenching temperature is 860-920 ℃ and the holding time is less than 60 min. When the quenching temperature reaches 950 ℃ and the holding time exceeds 30 min, the grain size of the prior austenite gradually increases with the holding time increasing. Thus, when the quenching temperature is lower than 950 ℃, Nb has an inhibitory effect on the growth of the prior austenite grains in the heat treatment process of 30MnB5 steel. When the quenching temperature reaches 1000 ℃, Nb only has a slight inhibitory effect on the growth of the prior austenite grain within 30 min. When the quenching holding time exceeds 60 min, Nb completely loses its inhibitory effect on the growth of the original austenite grain.

Key words: prior austenite grain, Nb, 30MnB5 steel, quenching

CLC Number:

TG156.31

Yang Zhirong, Yan Desheng, Yang Huaijun. Effects of quenching process and Nb addition on prior austenite grain size of 30MnB5 steel[J]. Heat Treatment of Metals, 2020, 45(12): 218-221.

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