新型 G115 马氏体钢中 M23C6 的析出动力学和强化：利用二次正火

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International Pub Date : 2024-04-01 DOI:10.1016/j.pnsc.2024.04.005

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

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引用次数: 0

摘要

G115 马氏体钢有望成为蒸汽温度高于 650°C 的超超临界（USC）发电厂的首选材料之一。研究了 G115 马氏体钢在采用各种热处理工艺后的微观结构演变和机械性能。结果表明，采用各种热处理工艺后，G115 马氏体钢中的主要析出物是富含铬的 M23C6 相。根据析出-温度-时间（PTT）曲线，M23C6 相析出所需的时间随着二次正火温度的升高和保温时间的延长而缩短。M23C6 相的体积分数随二次正火温度和保温时间的增加而增加，这加强了析出物对位错恢复和板条生长的抑制作用。因此，G115 马氏体钢在最高二次正火温度和最长保温时间下可获得最佳机械性能。在目前的研究中，G115 马氏体钢的优异强度主要来源于析出物强化和板条强化。

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

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.

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.