High refractory, low misfit Ru-containing single-crystal superalloys

被引：74

作者：

Carroll, L. J.

Feng, Q.

Mansfield, J. F.

Pollock, T. M.

机构：

[1] Univ Sci & Technol Beijing, State Key Labv Adv Met & Mat, Beijing 100083, Peoples R China

[2] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2006年 / 37A卷 / 10期

关键词：

D O I：

10.1007/s11661-006-0174-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single-crystal Ru-containing nickel-base superalloys with spherical y' precipitates have been observed in alloys with substantial amounts of Re and W and high levels of Ru. The y' precipitates did not experience stress-induced shape changes (rafting) during creep deformation at 950 degrees C and 290 MPa, indicative of a y-y' lattice misfit very near zero. Furthermore, interfacial dislocation networks were not formed during creep deformation in the low misfit alloys. The alloys containing spherical precipitates had lower creep strengths than the alloys containing cuboidal precipitates at 950 degrees C and 290 MPa. Element partitioning between the phases was investigated in order to determine the origin of the unusual microstructural features. Transmission electron microscopy (TEM)-based energy-dispersive spectroscopy (EDS) analysis of the y and y' phases indicates that Ru affects the partitioning of Re, which partitions much less strongly to the matrix than previously observed in Re-containing superalloys, consistent with a lattice misfit very near zero. With high levels of Ru, the addition of Cr also has a strong influence on partitioning. These investigations demonstrate that Ru and Cr control the lattice misfit, precipitate shape, and creep behavior, through the associated changes in the gamma-gamma phase equilibrium.

引用

页码：2927 / 2938

页数：12

共 34 条

[1]

Caron P, 2000, SUPERALLOYS 2000, P737

[2]

Darolia R., 1988, Superalloys, V1988, P255, DOI DOI 10.7449/1988/SUPERALLOYS_1988_255_264

[3]

Dreshfield R.L., 2005, UNPUB

[4] Element partitioning during coarsening of (gamma-gamma') Ni-Al-Mo alloys [J].

Fahrmann, M ;

Fahrmann, E ;

Pollock, TM ;

Johnson, WC .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1997, 28 (09) :1943-1945

[5] INFLUENCE OF COHERENCY STRESS ON MICROSTRUCTURAL EVOLUTION IN MODEL NI-AL-MO ALLOYS [J].

FAHRMANN, M ;

FRATZL, P ;

PARIS, O ;

FAHRMANN, E ;

JOHNSON, WC .

ACTA METALLURGICA ET MATERIALIA, 1995, 43 (03) :1007-1022

[6] Determination of matrix and precipitate elastic constants in (γ-γ′) Ni-base model alloys, and their relevance to rafting [J].

Fahrmann, M ;

Hermann, W ;

Fahrmann, E ;

Boegli, A ;

Pollock, TM ;

Sockel, HG .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 260 (1-2) :212-221

[7] Solidification of high-refractory ruthenium-containing superalloys [J].

Feng, Q ;

Nandy, TK ;

Tin, S ;

Pollock, TM .

ACTA MATERIALIA, 2003, 51 (01) :269-284

[8]

FIELD RD, 1992, SUPERALLOYS 1992, P557

[9]

Fredholm A., 1984, SUPERALLOYS 1984, P211

[10] THE ROLE OF INTERFACIAL DISLOCATION NETWORKS IN HIGH-TEMPERATURE CREEP OF SUPERALLOYS [J].

GABB, TP ;

DRAPER, SL ;

HULL, DR ;

MACKAY, RA ;

NATHAL, MV .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 118 :59-69

← 1 2 3 4 →