Ni-Mo合金の耐食性および機械的性質におよぼすCの影響

抄録

Effect of carbon contents on the properties of Ni-Mo alloys has been investigated by hardness, tensile, microscopic and corrosion tests. The corrosion tests were carried out on specimens in boiling 20%HCl for 24 hours. The following results have been obtained. (1) With increasing content of carbon, both the weight loss by corrosion and the hardness of solution-treated Ni-Mo alloys have been increased, but the elongation was lowered. This may be attributable to the increase of the eutectic carbide (M₆C, a=11.09 Å), the amount of which increased by addition of carbon. (2) When air-cooled from annealing temperature of 700°C, the elongation decreased rapidly, and the higher the carbon contents, the more appreciably deteriorated the corrosion resistance due to the continious precipitation of M₆C (a=10.92 Å) on grain boundaries.