论文部分内容阅读
本文叙述了低温气体渗碳特点及对特殊零件——柴油机喷油咀偶件18Cr_2Ni_4WA 针阀体上应用。一般气体渗碳常用温度为900～950℃,多数用煤油作渗碳气源,这样工艺对18Cr_2Ni_4WA 材料将产生严重网状碳化物,影响零件机械性能,造成磨削裂纹,文本采用了830℃低温渗碳,用工业乙醇裂化气作渗碳气源,明显改善了表面碳浓度及碳化物形态,使碳化物呈颗粒献分布,改善了零件机械性能。并且减少了零件变形。
This paper describes the characteristics of low temperature carburizing gas and the special parts - diesel injection nozzle coupling element 18Cr_2Ni_4WA needle on the application. General gas carburizing commonly used temperature 900 ~ 950 ℃, the majority of kerosene carburizing gas source, so the process of 18Cr_2Ni_4WA material will have serious reticular carbides, affecting the mechanical properties of parts, resulting in grinding cracks, the text uses a low temperature of 830 ℃ Carburizing, with industrial ethanol cracked gas carburizing gas source, significantly improved the surface carbon concentration and carbide morphology, the carbide particles were presented to improve the mechanical properties of the parts. And reduce the deformation of the parts.