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Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels
J. Sun; Y. T. Zhang; P. Wang; Z. F. Ye; D. Z. Li
2014
Source PublicationActa Metallurgica Sinica-English Letters
ISSN1006-7191
Volume27Issue:4Pages:573-584
AbstractIn order to investigate the effect of N on the microstructure and room temperature mechanical properties of new-type high silicon martensitic heat-resistant steels, three steels containing the same total content of C and N but different N contents have been designed and prepared according to the thermo-calc calculation. The thermodynamic calculation and experiments indicate that the replacing of C by N changes the kind and volume fraction of precipitates of the high Si martensitic steel significantly. Along with the N content increasing, the precipitates in the samples after 750 degrees C tempering change from (Cr23C6 + VN + TaC) to (Cr23C6 + VN + TaC + TaN) and finally to (Cr23C6 + VN + Cr2N) according to both experimental results and thermodynamic calculations. The room temperature mechanical tests show that the strength of the steel decreases as the N content increases. However, the Charpy impact toughness increases with N content increasing. According to the calculation and SEM observation, it is inferred that the decrease of amount and size of precipitates accounts for the changes of the mechanical properties.
description.department[sun, jia ; zhang, yutuo] shenyang ligong univ, shenyang 110159, peoples r china. [sun, jia ; zhang, yutuo ; wang, pei ; ye, zhongfei ; li, dianzhong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhang, yt (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; ytzhang@imr.ac.cn ; pwang@imr.ac.cn
KeywordMartensitic Heat-resistant Steels Nitrogen Thermo-calc Precipitates Mechanical Properties Bismuth Eutectic Lbe Liquid Lead-bismuth Stainless-steel Numerical-simulation Enriched Steels Cr Steels Corrosion Behavior T91 Precipitation
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73374
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
J. Sun,Y. T. Zhang,P. Wang,et al. Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels[J]. Acta Metallurgica Sinica-English Letters,2014,27(4):573-584.
APA J. Sun,Y. T. Zhang,P. Wang,Z. F. Ye,&D. Z. Li.(2014).Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels.Acta Metallurgica Sinica-English Letters,27(4),573-584.
MLA J. Sun,et al."Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels".Acta Metallurgica Sinica-English Letters 27.4(2014):573-584.
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