高クロム鋳鉄のアブレシブ摩耗特性におよぼす炭化物面積率影響の線形解析

抄録

  High-Cr white cast irons of six eutectic carbide area fractions varied from 9.7 % to 24.5 % were abraded by 100-grit SiC polishing papers, with the test conditions of 3 mm × 3 mm apparent contact area, 21 N normal load and 65 mm/s sliding speed. The results reveal a plastic grooving dominated process. By increasing the carbide area fraction, coarsening the eutectic morphology and strengthening the matrix phase, the abrasion resistance is improved. The improvement can be rationalized with the linear equation that R_t=R_m + (kR_c - R_m) A_c, where R_t is the abrasion resistance of a given material with A_c as its carbide area fraction. R_m and R_c are the abrasion resistance of pure matrix material and pure carbide material, respectively, k is a modification factor which emphasizes interphase interaction.