铁素体不锈钢中铜析出相的长大和晶体结构演化规律研究

Yin Hongxiang,Wu Yi,Zhang Guanzhen,Li Xiang,Zhang Pengpai,Zhao Aimin

RARE METAL MATERIALS AND ENGINEERING（2021）

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Abstract

为研究铁素体不锈钢中铜析出相的析出过程和晶体结构演化规律,采用原子探针层析技术(APT)和高分辨透射电子显微镜(HRTEM)观察了铜析出相的长大过程.结果显示:随着时效时间的延长,富铜相尺寸增大,数量密度降低,析出相形状由最初的球状转化为椭球状,最后成为杆状.析出相长大曲线可以拟合为(r-)t = 2.45t1/3-4.46,符合Ostwald熟化规律.9R结构与基体的取向关系为((1-)(1-)4)9R//(011)α-Fe,[(1-)10]9R//[11(1-)]α-Fe.本实验钢含铜相析出序列为bcc→9R→3R→fcc.

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Key words

ultrapure ferritic stainless steel, copper precipitated phase, Ostwald ripening, crystal structure

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