Fe-C-Cr-Mo-W系多合金鋳鉄のエロージョン摩耗特性に及ぼすV, Nb, Co添加の影響

抄録

  Surface damage caused by the impact of solid particles is called erosive wear. This phenomenon is a serious problem in the bended sections of pneumatic transportation pipes, valves, turbine blades, fan, etc. To realize efficient and low cost manufacturing of parts, it is important to develop wear-resistant materials and estimate material life span during erosion.

  Recently, many studies are being conducted on various alloys, and attempts are being made to develop wear-resistant materials.

  This study focused on multi-component cast irons, which have excellent wear-resistance because they contain strong carbides forming elements which cause precipitation of hard eutectic carbides at solidification, allowing secondary hardening of the matrix by heat treatment.

  Multi-component cast irons with about 2mass% C and Cr, Mo, W, and V (as an alternative of Nb) of about 5mass% with 0, 5 and 10mass%Co were prepared as test materials in this study. Erosive wear characteristics of the multi-component cast irons were investigated. The impact angle dependency of all the specimens decreased but differences in the erosion rates were seen. Especially, 5V-10Co showed excellent erosive wear resistance. This is because when the Co content increases, secondary carbides precipitate in the matrix and the matrix becomes tougher, thereby suppressing the plastic deformation of the material surface.