Precipitation kinetics and strengthening of M23C6 in novel G115 martensitic steel:Utilizing secondary normalizing

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外文摘要：G115 martensitic steel is anticipated to be one of the preferred candidate materials in ultra-super critical(USC)power plants with steam temperatures above 650 C.Microstructure evolutions and mechanical properties of G115 martensitic steel after applying various heat treatment processes were investigated.The results demonstrate that the main precipitate in G115 martensitic steel after applying various heat treatment processes is M23C6 phase with Cr enrichment.The time required for M23C6 phase precipitation decreases with increasing secondary normalizing temperature and the extension in holding time according to its precipitation-temperature-time(PTT)curves.Volume fraction of M23C6 phase increases with increasing secondary normalizing temperature and holding time,which strengthens the inhibitory effect of precipitates on dislocations recovery and laths growth.Therefore,G115 martensitic steel can obtain the best mechanical properties after applying the highest secondary normalizing temperature and the longest holding time.In the current work,the excellent strength of G115 martensitic steel mainly derives from precipitates strengthening and laths strengthening.

外文关键词：

G115 martensitic steelPrecipitation kineticsSecondary normalizingM23C6 phaseStrengthening mechanisms

作者：

Chengxian Zhang、Zhi Yuan、Qiuzhi Gao、Qingshuang Ma、Hailian Zhang、Jing Bai、Huijie Zhang、Liming Yu、Huijun Li

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作者单位：

School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China

School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao,066004,China

School of Materials Science&Engineering,Tianjin University,Tianjin,300354,China

School of Mechanical,Materials and Mechatronic Engineering,University of Wollongong,Wollongong,NSW,2522,Australia

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China-Joint Fund of Iron and Steel Researchthe"333"Talent Project of Hebei Province

项目编号：

5217110752201203U1960204B20221001

出版年：

2024

DOI：

10.1016/j.pnsc.2024.04.005

自然科学进展·国际材料(英文)

国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25

ISSN：1002-0071

年,卷(期)：2024.34(2)

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