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Dynamic Strain Aging in a Newly Developed Ni-Co-Base Superalloy with Low Stacking Fault Energy
C. G. Tian; C. Y. Cui; L. Xu; Y. F. Gu; X. F. Sun
2013
Source PublicationJournal of Materials Science & Technology
ISSN1005-0302
Volume29Issue:9Pages:873-878
AbstractCharacteristics of dynamic strain aging (DSA) in a Ni-Co-base superalloy were studied by tensile tests at temperatures ranging from 250 degrees C to 550 degrees C and strain rates ranging from 3 x 10(-5) to 8 x 10(-4) s(-1). Serrated flow in the tensile stress-strain curves was observed in the temperature range from 300 degrees C to 500 degrees C. Normal DSA behavior was found at temperatures ranging from 300 degrees C to 350 degrees C, while inverse DSA behavior was observed at temperatures ranging from 400 degrees C to 500 degrees C. The yield strength, ultimate tensile strength, elongation, work hardening index, and fracture features were not affected by temperature and strain rates in DSA regime. Negative strain-rate sensitivity of flow stress was observed in DSA regime. The analysis suggests that the ordering of the substitutional solutes around some defects like mobile dislocations and stacking faults due to the thermal activated process may cause the serrations on the tensile curves.
description.department[tian, chenggang ; cui, chuanyong ; xu, ling ; gu, yuefeng ; sun, xiaofeng] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; cui, cy (reprint author), chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; chycui@imr.ac.cn
KeywordNi-co Base Superalloy Dynamic Strain Aging (Dsa) Activation Energy Substitutional Solute Stacking Fault Serrated Flow Activation-energy Mechanical-properties Rate Sensitivity Stress Temperature Alloy Parameters Model
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71501
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
C. G. Tian,C. Y. Cui,L. Xu,et al. Dynamic Strain Aging in a Newly Developed Ni-Co-Base Superalloy with Low Stacking Fault Energy[J]. Journal of Materials Science & Technology,2013,29(9):873-878.
APA C. G. Tian,C. Y. Cui,L. Xu,Y. F. Gu,&X. F. Sun.(2013).Dynamic Strain Aging in a Newly Developed Ni-Co-Base Superalloy with Low Stacking Fault Energy.Journal of Materials Science & Technology,29(9),873-878.
MLA C. G. Tian,et al."Dynamic Strain Aging in a Newly Developed Ni-Co-Base Superalloy with Low Stacking Fault Energy".Journal of Materials Science & Technology 29.9(2013):873-878.
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