含S快削Ni基合金の熱間加工性に及ぼすZrの影響

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Effect of zirconium on the hot-workability of resulfurized 12Cr-Ni type alloy has been studied by hot-upset and torsion tests. For cast alloys, critical reduction by upsetting shows high values in the range 17∼18 of Zr/S ratio. For forged alloy, number of twist to failure by torsion decreases with increasing of zirconium. With increasing of zirconium, the following sequence of changes in sulfide and zirconium compound: (Mn, Cr) S→(Zr, Mn, Cr) S+Ni5Zr→ZrS+Ni5Zr. In the amount of zirconium which forms zirconium sulfide free from other solid-solutioned metals and intermetallic compound Ni5Zr as low as possible, hot-workability was best. Machinability increased with increasing of zirconium and sulfur. In this alloy, the addition of 0.5∼0.8% zirconium and about 0.05% sulfur are desirable from viewpoints of hot-workability and machinability.
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