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| Study on Precipitation in Austenitic Stainless Steel 18Cr18Mn2MoN During Isothermal Aging at 900 ℃ |
| MA Yuxi1,2,RONG Fan2,ZHOU Rong1,LANG Yuping2, JIANG Yehua1 |
| 1. Faculty of Mechanical and Electrical Engineering， Kunming University of Science and Technology， Kunming 650093, Yunnan, China；2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The precipitation of nitrides(carbides) in solution treatment and aging process of 18Cr18Mn2MoN high nitrogen austenitic stainless steel was investigated by use of metallographic and electron microscopical analysis. The results show that precipitation process of Cr2N is divided in three steps:first, precipitation of chainlike Cr2N along grain boundaries;Second,precipitation of cellular Cr2N at meeting point of three intergranulars and a small amount of Cr2N precipitated in transgranularly;third, Cr2N precipitates grow from grain boundaries into grain gradually and are connected with trans granular Cr2N forming tablets and cover whole grain.with nitrides precipitation,σ,x and γ′ phases are formed.The precipitation mechanism is discussed.The crystalline structure of precipitates and orientation relationship between precipitates and matrix were studied with transmission electron microscopy(TEM) and selected area electron diffraction(SAD).
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Received: 01 January 1900
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2007, Vol. 42 
