多相强化型马氏体时效不锈钢中的合金元素偏聚效应研究
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-07-05
采用高分辨透射电镜(HRTEM)和原子探针层析技术(APT)等分析手段研究了一种多相强化型马氏体时效不
锈钢时效过程中的元素偏聚特征及其与材料力学和耐蚀性能的关系.
多相强化型马氏体时效不锈钢中的合金元素偏聚效应研究ALLOYING ELEMENT SEGREGATION EFFECT IN A MULTI-PHASE
STRENGTHENED MARAGING STAINLESS STEEL 采用高分辨透射电镜(HRTEM)和原子探针层析技术(APT)等分析手段研究了一种多相强化型马氏体时效不
锈钢时效过程中的元素偏聚特征及其与材料力学和耐蚀性能的关系. 结果表明, 马氏体时效不锈钢在时效过程中析
出三种强化相: 富 Mo 的 R′相、Ni3Ti 金属间化合物 η 相和富 Cr 的 α′相. 其中 R′相与 η 相一起形成核壳状结构, α′相
则单独弥散分布于基体中. 时效时间延长至 40 h 后, 主要强化相 η 相的成分、数量密度和等效半径基本稳定, 同时
马氏体时效不锈钢的强度不再发生明显的变化, 这种优异的抗过时效能力是由于核壳状结构的形成. 腐蚀实验结果
表明, 由于富 Cr 的 α′相的析出, 导致贫 Cr 区的形成, 进而降低了马氏体时效不锈钢的耐蚀性能.
Maraging stainless steels are the most widely used high strength stainless steels because of their excellent
combination of high strength, superior corrosion resistance and good weldability. The typical heat treatment of maraging
stainless steel consists of solution treatment and the following aging treatment. Aging treatment is the important process
since it affects the steel’s final properties and then determines its application prospect. Thus, understanding well the
segregation behavior of alloying elements during the aging treatment plays a key role in developing the new maraging stainless steel with superior properties. In this work, segregation of alloying elements as well as its effect on mechanical
properties and corrosion resistance of a multi-phase strengthened maraging stainless steel was studied by HRTEM and APT
analyses. It was found that three precipitating species including Mo-rich R′ phase, η phase and Cr-rich α′ phase were
identified in the steel. A unique core-shell structure with membrane-like R′ phase formed on the surface of η phase was
identified however α′ phase distributed in the matrix separately. The core-shell structure enabled the maraging stainless steel
a superior over-aging resistance and since aging time has reached 40 h, the characteristics of precipitations change little
even aging time prolongs to 100 h. The corrosion test results indicated that the occurrence of α′ phase resulted in the
formation of Cr-depleted zone and deteriorated the corrosion resistance seriously. In conclusion, the segregation behavior of
alloying elements in maraging stainless steel has a significant effect on both mechanical property and corrosion resistance
although some underlying mechanisms still haven’t been understood well.
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