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.
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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 |
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