Effects of Nitrogen Content and Austenitization Temperature on Precipitation in Niobium Micro-alloyed Steels

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Lei CAO
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1 Zhong-min YANG 已出版文章查询
Zhong-min YANG
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1 Ying CHEN 已出版文章查询
Ying CHEN
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1 Hui-min WANG 已出版文章查询
Hui-min WANG
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1 Xiao-li ZHAO 已出版文章查询
Xiao-li ZHAO
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1Central Iron and Steel Research Institute,Beijing 100081,China


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The influences of nitrogen content and austenitization temperature on Nb(C,N)precipitation in niobium micro-alloyed steels were studied by different methods:optical microscopy,tensile tests,scanning electron mi-croscopy,transmission electron microscopy,physicochemical phase analysis,and small-angle X-ray scattering. The results show that the strength of the steel with high nitrogen content is slightly higher than that of the steel with low nitrogen content.The increase in the nitrogen content does not result in the increase in the amount of Nb(C,N) precipitates,which mainly depends on the niobium content in the steel.The mass fraction of small-sized Nb(C,N) precipitates (1-10 nm)in the steel with high nitrogen content is less than that in the steel with low nitrogen con-tent.After austenitized at 1 150 ℃,a number of large cuboidal and needle-shaped particles are detected in the steel with high nitrogen content,whereas they dissolve after austenitized at 1 200 ℃ and the Nb(C,N)precipitates become finer in both steels.Furthermore,the results also show that part of the nitrogen in steel involves the formation of al-loyed cementite.

语种: 英文   

基金Item Sponsored by the CITIC-CBMM Niobium Steel Research an...


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