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K44镍基高温合金长期时效过程中γ'相粗化对拉伸性能的影响
Alternative TitleEFFECTS OF γ'-PRECIPITATE COARSENING ON TENSILE PROPERTIES OF Ni BASE SUPERALLOY K44 DURING LONG-TERM AGING
侯介山; 郭建亭; 周兰章; 叶恒强
2006
Source Publication金属学报
ISSN0412-1961
Volume42.0Issue:005Pages:481-486
Abstract研究了一种抗热腐蚀高温合金K44在800,850和900℃经(1-10)×10^3h长期时效后γ'相的变化和拉伸性能.结果表明,γ'沉淀相的长大动力学符合Lifshitz-Slyozof-Wagner熟化规律,长大激活能为255kJ/mol.相对较小的γ'相出现与弹性应变能相关的形态不稳定现象.合金屈服强度随时效温度升高和时效时间的延长而降低,可以由Labusch-Schwarz强化理论来解释,但塑性却出现了波动.合金的强化机制为强相互作用位错对的切割机制.
Other AbstractThe effects of long-term aging (800-900 ℃, (1-10)×10^3 h) on the γ' coarsening characteristics and the mechanical properties of a corrosion resistant Ni base superalloy K44 have been investigated. SEM observation reveals that the coarsening kinetics of γ' follows LSW theory at different temperatures and the activation energy for γ' growth is 255 kJ/mol. Morphological instability occured in relatively small γ' precipitates during aging process. At room temperature and 900 ℃, the yield strength decreases with increasing aging temperature and aging time, while a fluctuation of elongation was observed. The dependence of the yield stress on particle size is explained by Labusch-Schwarz hardening theory rather than classical strengthening theory on coherency and mismatch strengthening. Shearing of strong-coupled dislocations is dominant strengthening mechanism.
Keyword镍基高温合金K44 长期时效 沉淀相 强化理论
Indexed ByCSCD
Language中文
CSCD IDCSCD:2482740
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/147425
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
侯介山,郭建亭,周兰章,等. K44镍基高温合金长期时效过程中γ'相粗化对拉伸性能的影响[J]. 金属学报,2006,42.0(005):481-486.
APA 侯介山,郭建亭,周兰章,&叶恒强.(2006).K44镍基高温合金长期时效过程中γ'相粗化对拉伸性能的影响.金属学报,42.0(005),481-486.
MLA 侯介山,et al."K44镍基高温合金长期时效过程中γ'相粗化对拉伸性能的影响".金属学报 42.0.005(2006):481-486.
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