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前言六十年代开始,针对保护氧化法显示锅炉用钢奥氏体晶粒度中出现的问题,我们一方面进行晶界腐蚀法的研究,同时在不断总结经验的基础上使用了暴露氧化法。北京钢铁学院,我厂与钢铁研究院对此法进行了共同研究[1、2],许多钢厂也做了对比验证[3、4],以后经标准审定会议确认,于是暴露氧化法列为yB27—77奥氏体晶粒度的一种显示方法。近年来,随着暴露氧化法在生产检验中推广应用,反映出一些问题。一些单位认为,暴露氧化法显示的奥氏体晶粒度偏细,不能揭示钢中的混晶及粗晶现象[5]。至于造成这种差异的原因,可归纳为:奥氏体晶界早期氧化阻止晶粒长大;脱碳层的晶粒度与基体不同;氧化晶界不能显示晶粒长大孕育期长而得到的粗晶等[6]。本文是针对这些问题的试验分析结果。
Preface From the 1960s onwards, in order to protect the oxidation process from revealing the problems of austenite grain size in boiler steel, we conducted a study on the grain boundary corrosion method and used the exposure oxidation method on the basis of continuous experience. Beijing Institute of Iron and Steel, I plant and Iron and Steel Research Institute conducted a joint study of this method [1,2], many steel mills have also done a comparative verification [3,4], later confirmed by the standard validation meeting, so exposure to oxidation as YB27-77 austenite grain size of a display method. In recent years, with the exposure of oxidation in the production test application, reflecting some problems. Some units believe that exposure to oxidation shows too austenite grain size, can not reveal the mixed crystal and coarse grain in steel [5]. The reason for this difference can be summarized as follows: Early austenite grain boundaries prevent the grain growth of the early oxidation; decarburization layer grain size and matrix; oxide grain boundaries can not show the growth of the crystal growth period is long and get Of the coarse crystal [6]. This article is the result of an experimental analysis of these issues.