Effect of Nb on microstructure and impact properties of H13 steel

doi:10.13251/j.issn.0254-6051.2021.12.005

Abstract

Abstract: Microstructure and mechanical properties of the H13 tested steel with Nb content of 0, 0.067% and 0.270% (mass fraction) after quenching and tempering were comparatively studied by means of OM, SEM, EDS, phase analysis, hardness test and impact properties test. The results show that quenching hardness of the tested steel decreases after adding Nb. As the quenching temperature increases, the grain size of the Nb-containing tested steels is smaller than that of the 0Nb tested steel, but there are some undissolved carbides in the Nb-containing tested steels. The secondary hardening peak of the three tested steels after tempering all appear at 510 ℃. After quenching at 1050 ℃ and tempering at different temperatures, the impact absorbed energy of the 0.067Nb tested steel is higher than that of the 0Nb tested steel. Due to the influence of large-size carbides, when the quenching temperature is below 1080 ℃, the impact absorbed energy of the 0.27Nb tested steel is not as good as that of the other two tested steels.

Key words: Nb, H13 steel, grain size, impact absorbed energy, carbide

CLC Number:

TG142.1

Ouyang Weihao, Zhou Jian, Gao Peng, Lin Peng, Chi Hongxiao, Wang Wenjun. Effect of Nb on microstructure and impact properties of H13 steel[J]. Heat Treatment of Metals, 2021, 46(12): 24-30.

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