研究論文
高強度球状黒鉛鋳鉄の脆化に及ぼす接着剤塗布の影響
1998 年 70 巻 2 号 p. 109-114
詳細
1998 年 70 巻 2 号 p. 109-114
Adhesives such as thermosetting phenolic resin, urethane, epoxy resin and cyano-acrylate system are commonly used to bond strain gages and tensile specimens for strain measurement. The use of these adhesives in the tensile test resulted in embrittlement in austempered spheroidal graphite cast iron. Embrittlement due to use of adhesives is a characteristic of cast iron, since this behavior has not been reported in steels. The results obtained were as follows : (1) The tensile strength and elongation were reduced due to the coating by adhesives on ADI and quenched-tempered spheroidal graphite cast irons. (2) The reduction of elongation was increased with increasing graphite nodule diameter. (3) It suggested that the embrittlement of ADI and quenched-tempered ductile cast irons due to the coating by adhesives was caused by hydrogen embrittlement.
