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
EFFECTS OF γ'-PRECIPITATE COARSENING ON TENSILE PROPERTIES OF Ni BASE SUPERALLOY K44 DURING LONG-TERM AGING
查看参考文献16篇
文摘
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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. |
其他语种文摘
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The 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. |
来源
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金属学报
,2006,42(5):481-486 【核心库】
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关键词
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镍基高温合金K44
;
长期时效
;
沉淀相
;
强化理论
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地址
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0412-1961 |
学科
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金属学与金属工艺 |
文献收藏号
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CSCD:2482740
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