CREEP-INDUCED LOCAL LATTICE-PARAMETER CHANGES IN A MONOCRYSTALLINE NICKEL-BASE SUPERALLOY

被引：18

作者：

MUGHRABI, H ^{[1
]}

BIERMANN, H ^{[1
]}

UNGAR, T ^{[1
]}

机构：

[1] EOTVOS LORAND UNIV, INST GEN PHYS, H-1445 BUDAPEST, HUNGARY

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 1993年 / 2卷 / 04期

关键词：

HIGH-TEMPERATURE CREEP; INTERNAL STRESS; LATTICE MISMATCH; NICKEL-BASE SUPERALLOY; RESIDUAL STRESS; X-RAY DIFFRACTION;

D O I：

10.1007/BF02661741

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The gamma-gamma' lattice mismatch of specimens of the monocrystalline nickel-base superalloy SRR 99 has been measured by a high-resolution X-ray diffraction technique for the undeformed state and after high-temperature creep deformation. During creep deformation beyond the minimum creep rate (total strain almost-equal-to 0.5 %), the lattice mismatches, measured in and perpendicular to the [001] stress axis, respectively, undergo changes in opposite directions. This reflects the buildup of a complex deformation-induced triaxial state of internal stress in the phases gamma and gamma'. The overall resolved shear stresses that act in gamma' and gamma due to the combined action of the external and internal stresses are estimated, and the conditions under which cutting of the gamma' phase by dislocations should occur are discussed.

引用

页码：557 / 564

页数：8

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