【摘要】 借助于光学显徽镜、X-射线衍射、电子探针和显微硬度声发射技术等手段研究了5CrNiMo 钢硼钛共渗层的组织结构与脆性。结果表明,共渗层组织结构由（Fe、M）_?B 相为主,并伴有少量分散性的（Fe、M）₃ C 与 Fe-Ti、Ni-Ti、Cr-Ti、B-Ti、Si-Ti、Cr-Si 等化合物细微质点构成:（Fe、M）₂ B 相呈细针状,其组织致密,疏松轻微。与渗硼层相比共渗层的脆性降低48%,并对钛能降低共渗层脆性的主要原因作了初步探讨。更多还原

【Abstract】 The microstructure and brittleness of boron-titanizing layer for 5CrNiMo steel have been investigated by means of optical microscope,X-ray diffraction,electron microprobe and microhardness combined withacoustic emission.Results show that the structure of the cementation layer is composed of （Fe.M）₂ B phase,and has less dispersive （Fe.M）₃C,and compound particles of Fe-Ti,Ni-Ti,Cr-Ti,B-Ti,Si-Ti,Cr-Si etc.The（Fe.M）₂B phase is ring needle in shape and its structure being appeared not only closely but also lessporosity.The brittleness of co-penetrating has reduced by 48% compared with boionizing layer,and theprimary reason of titanium being able to reduce the brittleness of the diffusion of layer has been studied.更多还原