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HK40(4Cr25Ni20)耐热不锈钢离心铸管是目前石油化工生产中大量使用的炉管材料。在一般中碳耐热不锈钢中,M_(23)C_6型碳化物是主要的强化相。它的析出规律、形态、与母相奥氏体间的取向关系等等,已经作了很多研究。当合金元素的含量不同,凝固和热处理的条件不同,则碳化物的种类、形态等等也有所区别。而对HK40耐热不锈钢的离心铸管材料,在金相上即易见其碳化物种类及形态上有其与一般不锈钢不同的特点。本文对该材料的金属薄膜,进行了比较系统的电子显微术的观测与分析,为这种材料的使用在微观组织结构方面提供参考。
HK40 (4Cr25Ni20) heat-resistant stainless steel centrifugal cast pipe is currently used in large quantities in the production of petrochemical furnace tube material. In general heat-resistant stainless steel, M_ (23) C_6 carbide is the main strengthening phase. Its precipitation rules, morphology, and parent austenite orientation, etc., have made a lot of research. When the content of alloying elements are different and the conditions of solidification and heat treatment are different, the types and morphology of carbides are also different. The HK40 heat-resistant stainless steel centrifugal cast pipe material, the metallographic that is easy to see the type and shape of its carbide with the general characteristics of different stainless steel. In this paper, the material of the metal film, a relatively systematic observation and analysis of electron microscopy for the use of this material in the microstructure provides a reference.