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超级马氏体不锈钢(SMSSs)是典型的新一代13%Cr马氏体钢,含碳量较低,并含镍和钼,故具有更好的可焊性和低温韧性。研究表明,不锈钢低温等离子渗氮或氮碳共渗可形成硬的表层从而提高耐磨性。本文对SMSS试样分别在400℃、450℃和500℃进行了等离子渗氮和氮碳共渗,并对处理后的SMSS试样分别采用光学显微镜、显微硬度、XRD和干磨损试验进行了表征。X射线衍射分析证明,氮化铬含量随着渗氮和氮碳共渗温度的升高而增加,也显示出铁和铬的碳化物含量随着处理温度的升高而增加。不同温度下处理后的试样均随着处理温度的升高,磨损体积减小、耐磨性提高。对经等离子处理和未处理的试样所观察到的主要磨损机制都是凿削磨损。
Super Martensitic Stainless Steel (SMSSs) is a typical new generation of 13% Cr martensitic steel with a lower carbon content and nickel and molybdenum for better solderability and low temperature toughness. Research shows that stainless steel low temperature plasma nitriding or nitrocarburizing can form a hard surface to improve wear resistance. In this paper, the plasma nitriding and nitrocarburizing of SMSS samples were carried out respectively at 400 ℃, 450 ℃ and 500 ℃. The treated SMSS samples were examined by optical microscope, microhardness, XRD and dry wear tests respectively Characterization. X-ray diffraction analysis confirmed that the content of chromium nitride increased with the increase of nitriding and nitrocarburizing temperature, and also showed that the content of carbides of iron and chromium increased with the increase of the treating temperature. The specimens treated at different temperatures with the treatment temperature increases, the wear volume decreases, wear resistance increased. The main wear mechanism observed for both plasma-treated and untreated specimens is chisel wear.