用金相法、电镜观察等研究固溶+时效处理过程中超高氮奥氏体不锈钢氮化物及金属间相析出行为.结果表明:在超高氮奥氏体不锈钢中,随850℃等温时间的延长Cr2N析出过程为:沿晶界链条状析出→沿三晶界交汇处胞状析出并伴随少量的晶内析出→逐渐向晶内生长并与晶内析出相连呈层片状布满整个晶面,Cr2N的析出形态多以颗粒状、蠕虫状、层片状、菊花状分布;随着氮化物的析出伴随有σ相析出,这些金属间相多呈片状出现.探讨了各析出物的析出机理;通过析出物形貌TEM观察和选区衍射分析(SAD)确定了氮化物晶体结构及其与基体的位向关系;氮主要是以Cr2N和过饱和间隙原子的形式存在.
参考文献
| [1] | Speidel M O.Properties and application of high-nitrogen steels[M].London,1988 |
| [2] | Weiss B;Stickler R .Phase instabilities during high temperature exposure of 316 auatenitic stainless steel[J].Acta Metall,1972,3(04):851-866. |
| [3] | MA Yu-xi;RONG Fan;LANG Yu-ping.Study on precipitation in 1Cr22Mn15N stainless steel[A].中国,2006 |
| [4] | Beckitt F R .The formation of sigma phase from delta ferrite in a stainless steel[J].Iron Steel Inst,1969,207(05):632-638. |
| [5] | Tec-HO Lee;Sung-Jonn Kim;Yun-Chul Jung .Crystallographic details of precipitates in Fe-22Cr-21Ni-6Mo-(N) superaustenitic stainless steels aged at 900℃[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2000,31A:1713-1723. |
| [6] | Maehara Y;Fujino N;Kunitake T .Affects of plastic defonnation and thermal history on σ phase precipitation in duplex phase stainless steels[J].Transactions of the Iron and Steel Institute of Japan,1983,23(03):247-255. |
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