Title:
METHOD FOR PRODUCING NI-BASED SUPER-HEAT-RESISTANT ALLOY, AND NI-BASED SUPER-HEAT-RESISTANT ALLOY
Document Type and Number:
WIPO Patent Application WO/2020/195049
Kind Code:
A1
Abstract:
Provided are: a method for producing a Ni-based super-heat-resistant alloy having a constituent composition such that the equilibrium precipitation amount of a gamma-prime phase at 700ºC is 35 mol% or more; and a Ni-based super-heat-resistant alloy. This method includes: (a) a step for producing a first processed material by subjecting a material, in which the carbon content is 0.05-0.25 mass% and which has a constituent composition such that the equilibrium precipitation amount of a gamma-prime phase at 700ºC is 35 mol% or more, to plastic working at a temperature of 900ºC or higher and then cooling the same; and (b) a step for producing a first heat treated material by carrying out a heat treatment by heating the first processed material at a temperature of 900°C or higher. This method further includes (c) a step for producing a second processed material by subjecting the first heat treated material to plastic working at a temperature of 500°C or lower. The present invention is also a Ni-based super-heat-resistant alloy which is for cold plastic working, which has the foregoing constituent composition and which has a cross-sectional structure in which the areal ratio of M23C6 is 4.0 area% and the average particle diameter of the maximum diameter of crystal grains is 1.4-100 μm.
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Inventors:
TATSUMI YUSUKE (JP)
HAN GANG (JP)
HAN GANG (JP)
Application Number:
PCT/JP2020/001725
Publication Date:
October 01, 2020
Filing Date:
January 20, 2020
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22C19/05; C22F1/10; C22F1/00
Domestic Patent References:
| WO2018155446A1 | 2018-08-30 | |||
| WO2019004176A1 | 2019-01-03 |
Foreign References:
| JP2017514998A | 2017-06-08 | |||
| JP2014070230A | 2014-04-21 |
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