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首页> 外文期刊>Steel Research >Precipitation behaviour of 25 percent Cr - 5.5 percent Ni austenitic stainless steel containing 0.87 percent nitrogen
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Precipitation behaviour of 25 percent Cr - 5.5 percent Ni austenitic stainless steel containing 0.87 percent nitrogen

机译：沉淀行为为25Cr-5.5Ni奥氏体不锈钢，含0.87氮

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摘要

In this paper, a 25Cr - 5.5Ni steel (mass contents in percent), which originally had a ferritic-austenitic duplex microstructure (DIN material no. 1.4460), and to which mass contents of 0.87 percent nitrogen were added to become fully austenitic was studied. The phase transformations that occurred between 700 and 1350deg C were studied using several complementary techniques. Firstly, various treatments were carried out in the range 1050-1350deg C for lh to select the best temperature for solution heat treatment. Chromium nitride dissolution and absence of ferrite were was observed at 1250deg C for 1h. Subsequently, the specimens were aged in the range 700-1100deg C, for 90s up to 100h. The first phase to precipitate was chromium nitride. Ferrite precipitation occurred after long aging times, followed by sigma phase precipitation. A TTT diagram has been proposed.
机译：本文研究了一种25Cr-5.5Ni钢（质量含量百分比），该钢最初具有铁素体-奥氏体双相微观结构（DIN材料编号1.4460），并添加了质量含量为0.87%的氮以成为完全奥氏体。使用几种互补技术研究了在700至1350°C之间发生的相变。首先，在lh的1050-1350°C范围内进行各种处理，以选择最佳温度进行溶液热处理;在1250°C下观察氮化铬溶解和铁素体缺失1h。随后，将标本在700-1100°C范围内老化，持续90至100h。沉淀的第一相是氮化铬。铁氧体沉淀发生在长时间的老化后，然后是sigma相沉淀。已经提出了一个TTT图。

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