研究論文
セラミックスに対する高クロム鋳鉄の耐摩耗性に及ぼす組織形態の影響
1990 年 62 巻 1 号 p. 43-49
詳細
1990 年 62 巻 1 号 p. 43-49
Eutectic high chromium cast irons containing 17%Cr and 26%Cr were produced for this research by making each of them solidify unidirectionally. Abrasion test with abrasive papers of SiC and Al2O3 ceramics was carried out using test pieces cut from the castings at several distances from the chill face. The wear resistance was evaluated in connection with parameters such as eutectic colony size (EW), fraction of boundary region of the colony where comparatively large massive chromium carbides are crystallized (SB) and the average diameter of chromium carbides in the boundary area (DC). Wear rate (RW) was influenced by sort and particle size of caramic. The Rw against SiC was larger than that against Al2O3 under the similar size of ceramic. In case of SiC, the RW increased with an increase in its particle size. The RW reduced as the EW increased, and the RW of 26%Cr iron was smaller than that of the 17%Cr iron even at the same values of EW. Both of the SB and the DC can be related to the RW without consideration of chromium contents of the specimens, that is, the RW decreased in proportion to the SB and the DC, respectively. The wear resistance of annealed specimens showed 1.3 to 1.6 times as small as that of the as-cast specimes. As for the relations between RW and macro-hardness of the specimens, the hardness resulting in the minimium wear rate was found to be near Hv 550.
