Effect of soaking temperature on microstructure evolution and hardness ofTi-V complex microalloyed steel

doi:10.13251/j.issn.0254-6051.2021.03.030

Abstract

Abstract: Effect of soaking temperature on microstructure transformation and hardness of Ti-V microalloyed steel was investigated by means of OM, SEM and Vickers hardness tester. The reasons for microstructure evolution and hardness change were also clarified. The results show that the microstructure of Ti-V steel with different soaking temperatures is all martensite. As the soaking temperature rises from 1000 ℃ to 1250 ℃, the quenchened hardness of Ti-V steel decreases from 333 HV to 212 HV, and the prior austenite grain size increases from 52 μm to 209 μm. Above the total solution temperature, a small amount of TiN particles still exist and gradually dissolve with increasing of temperature. The pinning effect of the TiN on the grain boundaries is the main factor preventing the growth of grains. The influence of prior austenite size on the hardness of Ti-V steel gradually decreases with the increase of its size. Therefore, the soaking temperature should be below 1220 ℃ to avoid coarse grains.

Key words: Ti-V complex microalloyed steel, soaking temperature, microstructure, hardness

CLC Number:

TG156.1

Ni Lingling, Fu Xibin, Zhang Ke, Zhao Shiyu, Ren Wubin, Li Zhaodong, Li Jinghui, Zhang Mingya. Effect of soaking temperature on microstructure evolution and hardness ofTi-V complex microalloyed steel[J]. Heat Treatment of Metals, 2021, 46(3): 146-152.

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