Ti/Al比对GH984G合金长期时效过程中<i>γ</i>′沉淀相粗化行为及拉伸性能的影响

doi:10.11900/0412.1961.2014.00137

金属学报

2014, Vol. 50

Issue (10): 1260-1268 DOI: 10.11900/0412.1961.2014.00137

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Ti/Al比对GH984G合金长期时效过程中γ′沉淀相粗化行为及拉伸性能的影响

谭梅林, 王常帅, 郭永安, 郭建亭, 周兰章(

)

中国科学院金属研究所, 沈阳 110016

INFLUENCE OF Ti/Al RATIOS ON γ′ COARSENING BEHAVIOR AND TENSILE PROPERTIES OF GH984G ALLOY DURING LONG-TERM THERMAL EXPOSURE

TAN Meilin, WANG Changshuai, GUO Yongan, GUO Jianting(

), ZHOU Lanzhang

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

谭梅林, 王常帅, 郭永安, 郭建亭, 周兰章. Ti/Al比对GH984G合金长期时效过程中γ′沉淀相粗化行为及拉伸性能的影响[J]. 金属学报, 2014, 50(10): 1260-1268.
Meilin TAN, Changshuai WANG, Yongan GUO, Jianting GUO, Lanzhang ZHOU. INFLUENCE OF Ti/Al RATIOS ON γ′ COARSENING BEHAVIOR AND TENSILE PROPERTIES OF GH984G ALLOY DURING LONG-TERM THERMAL EXPOSURE[J]. Acta Metall Sin, 2014, 50(10): 1260-1268.

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摘要:

研究了2种Ti/Al比对新型Ni-Fe-Cr基合金GH984G在长达上万小时高温时效过程中γ′淀相的粗化行为及其拉伸性能的影响规律. 结果表明: 随时效温度从700 ℃升高至800 ℃, 球形γ′沉淀相的粗化速率明显增大. 在700和750 ℃长期时效过程中, 高Ti/Al比和低Ti/Al比合金γ′沉淀相的粗化行为均符合Lifshitz-Slyozof-Wagner (LSW) 理论, 受扩散过程控制, 高Ti/Al比合金中γ′沉淀相的粗化速率较高. 800 ℃长期时效过程中, 2种Ti/Al比合金γ′沉淀相的粗化行为偏离LSW理论. 此外, 时效时间小于3×10³ h时, 高Ti/Al比合金的γ′沉淀相长大较快, 进一步延长时效时间, 低Ti/Al比合金的γ′沉淀相长大速率较快. Ti/Al比对合金标准热处理态和700~800 ℃时效10480 h后合金的700 ℃拉伸性能无明显影响. 通过选取合适的Ti/Al比, 可以控制γ′沉淀相的粗化行为, 增强合金组织稳定性.

关键词 ： Ni-Fe-Cr基合金, 长期时效, γ′沉淀相, 粗化行为, 拉伸性能

Abstract：

GH984G is a new Ni-Fe-Cr base alloy which has been designed for use as superheater, reheater and header materials for boilers in 700 ℃ advanced ultra-supercritical (A-USC) coal-fired power plants. Compared with the CCA617, Nimonic 263 and IN 740 alloys, the GH984G is an economic alloy due to the elimination of Co and it containing more than 20%Fe. As a precipitation hardened alloy, the size of γ′ precipitates has great influence on the tensile properties. The γ′ precipitates become coarse during long-term thermal exposure. The coarsening behavior of γ′ precipitates is closely related with Ti/Al ratio. However, there are few investigations about the influence of Ti/Al ratio on the coarsening behavior of γ′ precipitates of GH984G alloy. Therefore, in this work, the coarsening behavior of γ′ precipitates and its influence on tensile properties of GH984G alloy with two Ti/Al ratios was investigated during long-term thermal exposure. The results show that the growth kinetic of the γ′ precipitates can be explained by Lifshitz-Slyozov-Wagner's theory of element diffusion controlled coarsening during long-term thermal exposure at 700 and 750 ℃. The rate of γ′ precipitates growth of the alloy with high Ti/Al ratio is higher. At 800 ℃, the rate of γ′ precipitates growth decreases with increasing the thermal exposure time. The coarsening behavior does not follow the Lifshitz-Slyozov-Wagner's theory. The reasons are attributed to the effect of elastic interaction energy and the depletion of γ′-forming elements in γ matrix. The Ti/Al ratio has no obvious influence on 700 ℃ tensile properties during long-term thermal exposure between 700 and 800 ℃. The 700 ℃ yield strength has no obviously decreases even if after thermal exposure at 700 ℃ for 10480 h. The ductility increases after thermal exposure at 800 ℃. The variation of strength and ductility is attributed to the coarsening of γ′ precipitation. The deformation mechanism is the moving dislocations shear γ′ precipitates and the stacking faults form in γ′ precipitates. The fracture mode is the mixture fracture mode. The Ti/Al ratio has no significance influence on the deformation mechanism and the fracture mode.

Key words： Ni-Fe-Cr base superalloy long-term aging γ′ precipitate coarsening kinetics tensile property

收稿日期: 2014-03-24

ZTFLH:

TG111.8

基金资助:* 国家高技术研究发展计划项目 2012AA03A501, 国家自然科学基金项目 51301171, 国家能源局项目 NY20110102-1和中国科学院-四川省成果转化项目资助

作者简介: null

谭梅林, 女, 1988年生, 硕士生

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表1 GH984G合金化学成分

图1 不同Ti/Al比GH984G合金标准热处理态的微观组织

图2 不同Ti/Al比合金中析出物的显微组织和EDS

图3 高Ti/Al比GH984G合金在750 ℃长期时效过程中的γ′沉淀相形貌

图4 2 种Ti/Al 比合金在长期时效过程中γ′沉淀相尺寸变化规律

图5 2 种Ti/Al 比合金在长期时效过程中γ′沉淀相尺寸变化规律

表2 Al和Ti在γ基体中的扩散系数

图6 不同Ti/Al比GH984G合金中γ′沉淀相的粗化规律

表3 长期时效对GH984G合金拉伸性能的影响

图7 高Ti/Al比合金经长期时效后的700 ℃瞬时拉伸断口形貌和g′沉淀相中的位错组态

图8 不同Ti/Al比合金分切应力与γ′沉淀相尺寸的关系

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