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Title:
METHOD FOR PRODUCING NI-BASED SUPER-HEAT-RESISTING ALLOY, AND NI-BASED SUPER-HEAT-RESISTING ALLOY
Document Type and Number:
WIPO Patent Application WO/2020/031579
Kind Code:
A1
Abstract:
Provided are: a method for producing a Ni-based super-heat-resisting alloy having such a compositional formula that the equilibrium volume for precipitations in a gamma prime phase at 700°C can become 35 mol% or more; and a Ni-based super-heat-resisting alloy. The method according to the present invention comprises the steps of: (a) subjecting a material having such a compositional formula that the content of carbon is 0.01 to 0.25% by mass and the equilibrium volume for precipitations in a gamma prime phase at 700°C can become 35 mol% or more to a plastic working procedure multiple times at a temperature of 500°C or lower in such a manner that the cumulative working ratio from the material can become 40% or more, thereby producing a first worked material; (b) subjecting the first worked material to a heat treatment at a temperature of 900°C or higher, thereby producing a first heat-treated material; and (c) further subjecting the first heat-treated material to a plastic working procedure once or multiple times at a temperature of 500°C or lower in such a manner the cumulative working ratio from the first heat-treated material can become 10% or more, thereby producing a second worked material. The Ni-based super-heat-resisting alloy according to the present invention has the above-mentioned compositional formula, wherein the defect rate in a cross-sectional structure is 0.5% by area or less.

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Inventors:
TATSUMI YUSUKE (JP)
MUHAMAD AINUL ARAFAH BINTI (JP)
HAN GANG (JP)
Application Number:
PCT/JP2019/026836
Publication Date:
February 13, 2020
Filing Date:
July 05, 2019
Export Citation:
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Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22F1/10; C22C19/05; C22F1/00
Domestic Patent References:
WO2018061317A12018-04-05
WO2018061540A12018-04-05
WO2016129485A12016-08-18
Foreign References:
US5976280A1999-11-02
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, P.C. (JP)
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