Title:
LOW THERMAL EXPANSION SUPER-HEAT-RESISTANT ALLOY AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/056674
Kind Code:
A1
Abstract:
Provided is a low thermal expansion super-heat-resistant alloy which has low thermal expansion, high strength, good oxidation resistance and good creep rupture ductility, while being suitable for large-size components by being free from the occurrence of macrosegregation.
A low thermal expansion super-heat-resistant alloy which is composed of, in mass%, 0.1% or less of C, 0.1-1.0% of Si, 1.0% or less of Mn, 25-32% of Ni, more than 18% but less than 24% of Co, more than 0.25% but 1.0% or less of Al, 0.5-1.5% of Ti, more than 2.1% but less than 3.0% of Nb, 0.001-0.01% of B and 0.0005-0.01% of Mg, with the balance being made up of Fe and unavoidable impurities, while satisfying Mg/S ≥ 1, 52.9 ≤ 1.235Ni + Co < 55.8%, (Al + Ti + Nb) is 3.5-5.5%, and the F value is 8% or less. This low thermal expansion super-heat-resistant alloy has a structure wherein a particulate intermetallic compound, which contains one or more elements selected from among Si, Nb and Ni in an amount of 36% by mass or more, is precipitated at the grain boundary of an austenite matrix and an intermetallic compound, which has a diameter of 50 nm or less and contains Ni, Al, Ti and Nb at concentrations higher than the concentrations thereof in the alloy, is precipitated in the austenite matrix.
More Like This:
Inventors:
UEHARA TOSHIHIRO (JP)
SATO NAOYA (JP)
SATO NAOYA (JP)
Application Number:
PCT/JP2016/072260
Publication Date:
April 06, 2017
Filing Date:
July 29, 2016
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22C38/00; C21D8/00; C22B9/04; C22B9/18; C22B61/00; C22C30/00; C22C38/14; C22C38/54; F01D5/28; F01D25/00; F01D25/26; F02C7/00
Foreign References:
JPS61231138A | 1986-10-15 | |||
JPH04218642A | 1992-08-10 | |||
JP2001234292A | 2001-08-28 | |||
JPH06228714A | 1994-08-16 | |||
JPS4879120A | 1973-10-24 | |||
JP2001214246A | 2001-08-07 |
Download PDF:
Previous Patent: DYNAMIC QUANTITY MEASURING APPARATUS
Next Patent: AUTOFOCUSING DEVICE, LENS DEVICE, AND AUTOFOCUSING METHOD
Next Patent: AUTOFOCUSING DEVICE, LENS DEVICE, AND AUTOFOCUSING METHOD