Title:
METHOD OF MANUFACTURING NI-BASED SUPER HEAT RESISTANT ALLOY EXTRUDED MATERIAL, AND NI-BASED SUPER HEAT RESISTANT ALLOY EXTRUDED MATERIAL
Document Type and Number:
WIPO Patent Application WO/2018/061317
Kind Code:
A1
Abstract:
Provided are a method of manufacturing a precipitation-strengthened Ni-based super heat resistant alloy extruded material with a high gamma prime content and an Ni-based super heat resistant alloy extruded material.
This method of manufacturing an Ni-based super heat resistant alloy extruded material includes: a first step in which an ingot obtained by casting molten metal having a component composition of a precipitation-strengthened Ni-based super heat resistant alloy in which the equilibrium precipitation amount of gamma prime at 700ºC is at least equal to 40 mol% is used as a billet, and the billet is heated to a hot working temperature that is at least equal to 1030ºC and is less than the gamma prime solvus temperature of the Ni-based super heat resistant alloy; and a second step in which the billet that has been heated to the hot working temperature is inserted into a container, a compressive force is imparted to the billet from one end side of the container, and the billet is extruded at an extrusion rate of 10 to 300 mm/s from a hole in a die placed at the other end side of the container, to yield an Ni-based super heat resistant alloy extruded material.
Furthermore, the Ni-based super heat resistant alloy extruded material has the component composition described hereinabove, with an average crystal grain diameter in a cross-sectional structure at most equal to 20 µm in terms of an equivalent circle diameter.
Inventors:
HAN GANG (JP)
KISHIGAMI ICHIROU (JP)
OHTANI TOMOIKU (JP)
KISHIGAMI ICHIROU (JP)
OHTANI TOMOIKU (JP)
Application Number:
PCT/JP2017/020143
Publication Date:
April 05, 2018
Filing Date:
May 30, 2017
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
B21C23/00; C22C19/05; C22F1/10
Domestic Patent References:
| WO2009142228A1 | 2009-11-26 |
Foreign References:
| JP2013518727A | 2013-05-23 | |||
| JPS5024108A | 1975-03-15 | |||
| JPS63125649A | 1988-05-28 |
Other References:
See also references of EP 3520915A4
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