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2. 发明公开

EP3299487A1 METHOD FOR SURFACE HARDENING A COLD DEFORMED ARTICLE COMPRISING LOW TEMPERATURE ANNEALING 有权
标题翻译：用于表面硬化包括低温退火的冷变形制品的方法
公开(公告)号：EP3299487A1
公开(公告)日：2018-03-28
申请号：EP16190934.6
申请日：2016-09-27
申请人： Bodycote plc
发明人： KARL, Andreas
IPC分类号： C23C8/02 , C23C8/22 , C23C8/26 , C23C8/32 , C23C8/38 , C23C8/46 , C23C8/50 , C23C8/56 , C21D1/06 , C21D1/26 , C21D6/00
摘要： The present invention relates to a method for surface hardening a cold deformed article at least partially consisting of stainless steel or a nickel base alloy with a chromium content of at least 10 % by weight, comprising the steps of:
a) providing a cold deformed article, wherein at least the surface region of the article is made of an alloy selected from the group consisting of stainless steel and nickel base alloys with a chromium content of at least 10 % by weight,
b) annealing the cold deformed article for 1 minute to 100 hours at a temperature between 300°C and 900°C in a non-carburizing atmosphere, a non-nitriding atmosphere and a non-nitrocarburizing atmosphere (i.e. atmosphere containing no compound nitrogen containing compound and no carbon containing compound),
c) activating the annealed article obtained in step b) and
d) simultaneously with step c) or after step c) heat treating the annealed article at a temperature of 100 to less than 550°C in plasma, in a salt bath or in a gaseous atmosphere to obtain a nitride, carburized and/or nitrocarburized diffusion zone in the surface area of the article, wherein the plasma, the salt bath or the gaseous atmosphere contains a compound selected from the group consisting of carbon, nitrogen containing compounds, carbon containing compounds and mixtures of two or more of the aforementioned compounds,
wherein the annealing in step b) is performed with a higher temperature than the heat treating in step d). In addition, the present invention relates to a surface hardened cold deformed article obtainable with this method.
摘要翻译：本发明涉及一种用于对至少部分由铬含量为至少10重量％的不锈钢或镍基合金构成的冷变形制品进行表面硬化的方法，该方法包括以下步骤：a）提供冷变形制品其中至少制品的表面区域由选自不锈钢和镍含量为至少10重量％的镍基合金的合金制成，b）将冷变形制品退火1分钟至在非渗碳气氛，非氮化气氛和非氮碳共渗气氛（即不含化合物含氮化合物和不含碳化合物的气氛）中，在300℃和900℃之间的温度下100小时，c）活化在步骤b）中获得的退火制品和d）与步骤c）同时或在步骤c）之后在等离子体中，在盐浴中或在盐浴中在100至低于550℃的温度下热处理退火制品或在气体气氛中在制品的表面区域获得氮化物，渗碳和/或氮碳共渗扩散区，其中等离子体，盐浴或气体气氛含有选自碳，含氮化合物，含碳化合物和两种或更多种上述化合物的混合物，其中步骤b）中的退火在比步骤d）中的热处理更高的温度下进行。此外，本发明涉及可用该方法获得的表面硬化的冷变形制品。

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