Anelasticity in austenitic stainless steel

被引：31
作者：
Rao, Ashwin [1 ]
Bouchard, P. John [1 ]
Northover, Shirley M. [1 ]
Fitzpatrick, Michael E. [1 ]
机构：
[1] Open Univ, Milton Keynes MK7 6AA, Bucks, England
来源：
ACTA MATERIALIA | 2012年 / 60卷 / 19期
基金：
英国工程与自然科学研究理事会;
关键词：
Creep test; Neutron diffraction; Transmission electron microscopy (TEM); Austenitic steels; HIGH-TEMPERATURE CREEP; PLASTIC-DEFORMATION; INTERNAL-STRESSES; FRICTION STRESS; RECOVERY; TRANSIENTS; RELAXATION; REFINEMENT; BOUNDARY; BEHAVIOR;
D O I：
10.1016/j.actamat.2012.08.060
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 degrees C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：6851 / 6861
页数：11
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