一种新型ni基耐热合金在750℃时效过程中的组织演变与力学性能

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI:10.1016/S1006-706X(17)30078-X
Zhong-liang Tian , Sen-bao Jiang , Zheng-zong Chen , Han-sheng Bao , Zheng-dong Liu
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引用次数: 5

摘要

研究了先进超超临界(a- usc)汽轮机转子用新型候选ni基耐热合金在750℃时效至10000 h过程中的组织演变和力学性能。根据晶粒形态、分布和生长动力学表征了奥氏体晶粒内γ′粒子和M23 C6碳化物沿晶界的演变。时效10000 h后,γ′球形粒子的平均半径从20.3 nm增大到90.0 nm,其粗化行为符合Lifschitz-Slyosovd-Wagner (LSW)定律。750℃长时间时效后,γ′颗粒的质量分数从10.0 wt. %略微增加到12.0 wt. %。富cr的M23C6碳化物沿晶界不连续析出,而在时效处理过程中没有形成其他有害相,因此这些不连续分布的碳化物增强了晶界强度。γ′的临界尺寸直接影响合金的最大硬度。此外,该合金在高温下长时间时效后具有良好的冲击韧性,保证了安全性。
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Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750 °C

Microstructural evolution and mechanical properties of a new candidate Ni-based heat-resistant alloy for advanced ultra-supercritical (A-USC) steam turbine rotors were investigated during aging at 750 °C up to 10000 h. The evolutions of γ′ particles inside austenitic grain and M23 C6 carbides along grain boundaries were characterized according to their morphologies, distributions, and growth kinetics. Mean radius of the γ′ spherical particles grew from 20.3 to 90.0 nm after aging for 10000 h, and the corresponding coarsening behavior was conformed to the law of Lifschitz-Slyosovd-Wagner (LSW). The weight fraction of γ′ particles slightly increased from 10.0 to 12.0 wt. % after aging of long duration at 750 °C. The Cr-rich M23C6 carbides discontinuously precipitated along grain boundaries, while other detrimental phases were not formed during the aging treatment, and hence the strength of grain boundary was enhanced by these discontinuously distributed carbides. The critical size of γ′ had a direct influence on the maximum hardness of this alloy. Moreover, this alloy presented a good impact toughness for the safety after long time aging at high temperature.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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