标准热处理态11%Cr铁素体/马氏体钢辐照前后的显微组织

doi:10.13251/j.issn.0254-6051.2025.01.001

金属热处理 ›› 2025, Vol. 50 ›› Issue (1): 6-11.DOI: 10.13251/j.issn.0254-6051.2025.01.001

标准热处理态11%Cr铁素体/马氏体钢辐照前后的显微组织

沃建行, 沈寅忠

上海工程技术大学材料科学与工程学院, 上海 201620

收稿日期:2024-08-12 修回日期:2024-11-18 出版日期:2025-01-25 发布日期:2025-03-12
通讯作者: 沈寅忠,教授,E-mail:shenyz@sues.edu.cn
作者简介:沃建行(1999—),男,主要研究方向为高Cr铁素体/马氏体钢,E-mail:1320733273@qq.com。
基金资助:
国家自然科学基金重点项目(51034011);中国科学技术部ITER-国家磁约束核聚变能计划(2011GB113001)

Microstructure of 11%Cr ferritic/martensitic steel in normally heat-treated state before and after irradiation

Wo Jianxing, Shen Yinzhong

School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Received:2024-08-12 Revised:2024-11-18 Online:2025-01-25 Published:2025-03-12

摘要/Abstract

摘要： 采用透射电镜和能谱分析技术对标准热处理态11%Cr铁素体/马氏体钢辐照前后的微观结构进行了详细研究。结果表明:辐照前后11%Cr铁素体/马氏体钢中主要组织为回火马氏体,内含微量δ-铁素体。辐照前马氏体板条的边界和内部含有少量的析出相颗粒,其尺寸较小;在δ-铁素体与基体界面含有一些不规则的块状黑色大颗粒;δ-铁素体内部没有析出相颗粒。辐照后在马氏体板条的边界和内部出现了大量的棒状和块状析出相颗粒,其数量相比辐照前明显增多,其尺寸相比辐照前增大;在δ-铁素体与基体界面交汇处不规则的块状黑色大颗粒数量相比辐照前增多;在δ-铁素体内部生成了大量块状和针状的析出相,该类析出相可能为富Cr的氮化物,富Cr的碳氮化物和Fe-W类析出相。辐照后马氏体板条内部的析出相颗粒为富Cr的M₂₃C₆相,与辐照前富Cr的M₂₃C₆相对比,M₂₃C₆相的中Cr和Ta元素含量稍微下降,Fe和Nd元素含量少量上升,但总体来说,富Cr的M₂₃C₆析出相的平均金属元素成分含量变化相对较小。

关键词: 高Cr铁素体/马氏体钢, 显微组织, 析出相, 高温辐照

Abstract: The microstructure of 11%Cr ferritic/martensitic steel in the normally heat-treated state before and after irradiation was experimentally studied by using transmission electron microscopy and energy dispersive spectroscopy. The results show that the primary microstructure of the 11%Cr ferritic/martensitic steel before and after irradiation consists of tempered martensitic along with a small amount of δ-ferrite. Before irradiation, a small amount of precipitates with a relatively small size are present at martensite boundaries and within martensite laths. Some irregular, blocky, large black particles are present at the interface of δ-ferrite and matrix. There are no precipitates within δ-ferrite grains. After irradiation, a large number of rod-like and blocky precipitates appear at the boundaries and interior of the martensitic lath, while the number and size of precipitates significantly increase compared to that before irradiation. The number of irregular blocky black particles at the interface of δ-ferrite and matrix increase compared to that before irradiation. Inside the δ-ferrite, a large number of blocky and needle-like precipitates are formed which may be Cr-rich nitrides, Cr-rich carbonitrides and Fe-W type precipitates. After irradiation, the precipitates inside the martensitic laths are Cr-rich M₂₃C₆ phase. Compared with the Cr-rich M₂₃C₆ phase before irradiation, the Cr and Ta contents in the M₂₃C₆ phase slightly decrease, while the Fe and Nd contents slightly increase after irradiation. However, overall, the changes in the average metal element composition of the Cr-rich M₂₃C₆ phase are relatively small.

Key words: high-Cr ferritic/martensitic steel, microstructure, precipitated phase, high-temperature irradiation

中图分类号:

TG142.73

沃建行, 沈寅忠. 标准热处理态11%Cr铁素体/马氏体钢辐照前后的显微组织[J]. 金属热处理, 2025, 50(1): 6-11.

Wo Jianxing, Shen Yinzhong. Microstructure of 11%Cr ferritic/martensitic steel in normally heat-treated state before and after irradiation[J]. Heat Treatment of Metals, 2025, 50(1): 6-11.

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标准热处理态11%Cr铁素体/马氏体钢辐照前后的显微组织

Microstructure of 11%Cr ferritic/martensitic steel in normally heat-treated state before and after irradiation

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