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本文研究了编号为Si—1、Si—2、Si—3、Si—4四种高硅奥氏体不锈钢的组织、析出相的种类、分布及对钢耐浓硝酸腐蚀性能的影响。结果表明,由于钢中的碳含量和添加元素不同、以及铬、镍含量的差异、固溶温度的变化,钢中析出相亦各不相同。析出相数量增多及它们在晶内和晶界分布,均有利于浓硝酸的择优腐蚀。每种钢在晶界以不同速度腐蚀是由于晶界析出相的种类及数量不同所致,晶界析出M_(23)C_6(M主要是Cr),且成网状或链状分布,极易产生晶问腐蚀。结果还表明四种钢对浓硝酸都具有较好的抗蚀能力,就综合性能而言,以Si-3最佳。
In this paper, the microstructure and phase of the precipitated phases of Si-1, Si-2, Si-3 and Si-4 austenitic stainless steels were studied. The results show that due to the carbon content of steel and added elements, as well as chromium, nickel content differences, the solution temperature, the precipitation phase of steel are also different. Increasing the number of precipitates and their distribution in the grain and grain boundary, are conducive to the selective nitric acid corrosion. Each steel in the grain boundary at different rates of corrosion due to the grain boundary precipitation of the type and number of different due to the grain boundary precipitation M_ (23) C_6 (M is mainly Cr), and into a network or chain-like distribution, extremely easy Generate crystal corrosion. The results also show that the four kinds of steel have strong nitric acid corrosion resistance, the overall performance, the best Si-3.