一、工艺现状与存在问题我厂某产品中的活门衬套偶件,均使用4Cr14Ni14W2Mo奥氏体耐热不锈钢制造。为提高它的耐磨性,需要进行氮化处理。因为活门偶件对零件的尖边质量要求极为严格,而零件氮化后的脆性又与钢材原始金相组织有直接的关系。因此从原材料入厂到氮化前预先热处理,对原始金相组织的晶粒度、双晶和碳化物分布等都提出严格的要求。 First, the status quo and existing problems I plant a product in the valve sleeve bushing, are used 4Cr14Ni14W2Mo austenitic heat-resistant stainless steel. To improve its wear resistance, nitriding is required. Because the valve parts on the sharp edge of the quality requirements of the most stringent parts and nitriding brittleness and the steel has a direct relationship between the original microstructure. Therefore, from the raw material into the plant before the pre-nitriding heat treatment, the original microstructure of the grain size, twin and carbide distribution and so put forward stringent requirements.