Effect of nitrogen content on microstructure and mechanical properties of HPD-1 duplex stainless steel

doi:10.13251/j.issn.0254-6051.2020.09.038

Abstract

Abstract: Effect of nitrogen content on hardness,tensile properties,low temperature impact toughness and fatigue properties of HPD-1 duplex stainless steel in the range of 0.08wt%-0.22wt% were studied by means of microstructure observation and mechanical properties testing.The results show that the γ/α phase ratio of the tested steel is significantly affected by the nitrogen content,when the nitrogen content is increased from 0.08wt% to 0.22wt%,the content of γ phase is increased from 38.1% to 56.5%.The hardness of α phase is increased from 273 HV10 to 343 HV10,and that of γ phase is increased from 238 HV10 to 299 HV10,resulting in the strength of the tested steel being dramatically improved.The low temperature impact properties of the tested steel is increased at first and then decreased,which is caused by the combined influence of nitrogen on the two phase ratio.The fatigue crack initiation and propagation can be inhibited due to a higher nitrogen content,which plays an important role in the fatigue performance at room temperature of the HPD-1 duplex stainless steel,meanwhile the tearing edge is the main characteristic of fatigue fracture.

Key words: nitrogen content, duplex stainless steel, impact properties, fatigue properties

CLC Number:

TG142.1

Ning Xin, Song Zhigang, Feng Han, Huang Bo, Yu Zhichuan, Zheng Wenjie, He Jianguo, Zhu Yuliang. Effect of nitrogen content on microstructure and mechanical properties of HPD-1 duplex stainless steel[J]. Heat Treatment of Metals, 2020, 45(9): 210-214.

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