Al添加溶融ほう砂浴を用いたSUS304ステンレス鋼のほう化処理に及ぼす処理温度の影響

概要

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The steel material is used for various applications, and there are a lot of parts to which wear resistance is required. For instance, steel is used in gears and turbine blades exposed to high-speed fluid which contains fine particles. The austenitic stainless steel is excellent in corrosion resistance. However, because it is not possible to stiffen by quenching, the development of the method of improving abrasion resistance is required. Recently, boriding is seen as a solution. Boriding is divided roughly into molten salt bath method, powder-pack method, gas phase method, and electrolytic method. Among the method mentioned, molten salt bath method is the easiest technique which can be processed without special equipment. In this research, the influence of processing temperature on the formation layer of SUS304 steel by Al added fused salt bath was examined. Boriding were performed in molten borax which contained 10mass%Al at processing temperatures of 1123-1223 K (processing time of 7.2 ks). As a result of the examination, the hardness of the boriding layer becomes about 1900 HV when the processing temperature of 1223 K. Also the wear resistance has improved remarkably. Furthermore, it was understood that the formation layer on the surface was FeB and Fe2B from the Vickers hardness and the analysis of the X-ray diffraction measurement.