多相強(qiáng)化型馬氏體時(shí)效不銹鋼中的合金元素偏聚效應(yīng)研究
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-07-05
采用高分辨透射電鏡(HRTEM)和原子探針層析技術(shù)(APT)等分析手段研究了一種多相強(qiáng)化型馬氏體時(shí)效不
銹鋼時(shí)效過程中的元素偏聚特征及其與材料力學(xué)和耐蝕性能的關(guān)系.
多相強(qiáng)化型馬氏體時(shí)效不銹鋼中的合金元素偏聚效應(yīng)研究ALLOYING ELEMENT SEGREGATION EFFECT IN A MULTI-PHASE
STRENGTHENED MARAGING STAINLESS STEEL 采用高分辨透射電鏡(HRTEM)和原子探針層析技術(shù)(APT)等分析手段研究了一種多相強(qiáng)化型馬氏體時(shí)效不
銹鋼時(shí)效過程中的元素偏聚特征及其與材料力學(xué)和耐蝕性能的關(guān)系. 結(jié)果表明, 馬氏體時(shí)效不銹鋼在時(shí)效過程中析
出三種強(qiáng)化相: 富 Mo 的 R′相、Ni3Ti 金屬間化合物 η 相和富 Cr 的 α′相. 其中 R′相與 η 相一起形成核殼狀結(jié)構(gòu), α′相
則單獨(dú)彌散分布于基體中. 時(shí)效時(shí)間延長(zhǎng)至 40 h 后, 主要強(qiáng)化相 η 相的成分、數(shù)量密度和等效半徑基本穩(wěn)定, 同時(shí)
馬氏體時(shí)效不銹鋼的強(qiáng)度不再發(fā)生明顯的變化, 這種優(yōu)異的抗過時(shí)效能力是由于核殼狀結(jié)構(gòu)的形成. 腐蝕實(shí)驗(yàn)結(jié)果
表明, 由于富 Cr 的 α′相的析出, 導(dǎo)致貧 Cr 區(qū)的形成, 進(jìn)而降低了馬氏體時(shí)效不銹鋼的耐蝕性能.
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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