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1. (WO2016052523) METHOD FOR PRODUCING Ni-BASED SUPER HEAT-RESISTANT ALLOY

Pub. No.:    WO/2016/052523    International Application No.:    PCT/JP2015/077553
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Wed Sep 30 01:59:59 CEST 2015
IPC: B21J 3/00
B21J 5/00
C22C 19/05
C22F 1/00
C22F 1/10
Applicants: HITACHI METALS,LTD.
日立金属株式会社
Inventors: AOKI, Chuya
青木 宙也
UENO, Tomonori
上野 友典
Title: METHOD FOR PRODUCING Ni-BASED SUPER HEAT-RESISTANT ALLOY
Abstract:
Provided is a method for producing an Ni-based super heat-resistant alloy capable of uniformly maintaining a glass lubricant coating even after being heated to hot forging temperature. In this method for producing the Ni-based super heat-resistant alloy, a forging stock which will form the Ni-based super heat-resistant alloy is coated with a lubricant, and hot forged. The method for producing the Ni-based super heat-resistant alloy is characterized by including: a preliminary oxidation step in which a Cr oxide film having a film thickness of 0.5-50 µm is formed in advance on the forging stock to obtain a preliminarily oxidized material; a lubricant coating step in which the preliminarily oxidized material is coated with a glass lubricant having borosilicate glass as a main component thereof, to obtain a material to be forged; and a hot forging step in which the material to be forged is hot forged to obtain a hot-forged material.