钒的添加对S30432奥氏体耐热钢影响的研究

doi:10.11896/cldb.20080072

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Abstract The effect of 0.18% V addition on S30432 austenitic heat-resistant steel was studied in this paper. Creep rupture time at 650 ℃ and hardness before and after crept at 650 ℃ of V-free and V-containing steels were compared. OM, SEM, TEM and Thermo-Calc software were used to study the influence of 0.18% V on the precipitates in S30432 steel. The mechanism of improving strength of V-containing S30432 heat-resistant steel was also analyzed. The results show that the addition of 0.18% V to S30432 steel leads in the increase of creep rupture time at 650 ℃ and hardness. Not only the grains become finer, but also there are more secondary MX particles in V-containing S30432. In particular, a large number of fine Z-phase(Cr(Nb,V)N) precipitate in V-containing S30432 steel. Because the solution temperature of V(C,N) is lower than Nb(C,N), the addition of V accelerates the dissolution of more MX and promotes the precipitation of fine Z-phase in V-containing S30432 steel. The precipitation strengthening of Z-phase is the main reason to improve the hardness and strength of V-containing S30432 steel.

Key words： vanadium S30432 heat-resistant steel strength Z-phase

Published: 12 November 2021

CLC number:

TG132.3

Fund:National Key Research and Development Project of China (2016YFC0801901), the National Natural Science Foundation of China (51171097).

Corresponding Authors: lhzhu@i.shu.edu.cn

About author:: Youwang Tu is a postgraduate of Shanghai University. He is mainly engaged in the research on the microstructure and properties of heat-resistant steel.
Lihui Zhu is a professor, doctoral supervisor of Shanghai University.She graduated from Xi’an Jiaotong University in 1998 with a doctor’s degree.She is mainly engaged in the research of heat-resistant steel used in supercritical and ultra-supercritical boilers and the coating of cemented carbide tools.

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	TU Youwang
	ZHU Lihui
	KE Zhigang
	ZHOU Renyuan
	SONG Ming

Cite this article:

TU Youwang,ZHU Lihui,KE Zhigang, et al. Study on the Influence of Vanadium on S30432 Austenitic Heat-resisting Steel[J]. Materials Reports, 2021, 35(20): 20113-20118.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20080072 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20113

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