Surface structure control of ferrous materials by non-equilibrium phases of low temperature plasma treatment

建立了一种不降低奥氏体不锈钢耐腐蚀性能的表面硬化方法。结果表明，硬化是由于过饱和间隙原子浓度的增加，使晶格膨胀，导致材料的过饱和程度增加而发生的。通过有效的替代元素的添加，可以增厚表面硬化层的深度。阐明了DLC涂层对硬化S相的粘附性。它还阐明了通过碳和氮扩散在双层结构的表面处形成的过量表面冷凝可以通过特定的Ar等离子体照射条件有效地去除。

A surface hardening method was established for austenitic stainless steels without degradation of anticorrosion properties. It was clarified that the hardening is occurred by the increase of supersaturated interstitial concentration, which expands the lattice, the expansion induces the more super saturation of interstitials. The depth of the hardened surface layer can be thickened by effective additional substitutional elements.Further structure formation was tried by combination of DLC coating. Adhesion of the DLC coating to hardened S phase was clarified. It also clarified that the excess surface condensation formed at the surface of a duplex layer structure by carbon and nitrogen diffusion can be removed effectively by specific Ar plasma irradiation conditions.