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Mar-M247高温合金涡轮叶片微结构及拉伸性能研究
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作者单位:

1.浙江大学 材料科学与工程学院;2.杭州汽轮动力集团股份有限公司;3.浙江大学材料科学与工程学院

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中图分类号:

TG132.3+2

基金项目:

浙江省‘尖兵’‘领雁’研发攻关计划(2023C01137)


Study on Microstructure and Tensile Properties of Mar-M247 Superalloy Turbine Blades
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Affiliation:

School of Materials Science and Engineering, Zhejiang University

Fund Project:

"Pioneer" and "Leading Goose" R&D Program of Zhejiang(2023C01137)

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    摘要:

    以Mar-M247镍基高温合金涡轮叶片为研究对象,在室温至980 ℃范围内开展拉伸测试,分析了合金的微观组织、拉伸性能及断裂机制。结果表明:合金的微观组织主要为γ相、花状γ′相、γ/γ′共晶组织和碳化物相;合金强度随温度升高呈现先增后降趋势。低温断裂呈现穿晶为主,沿晶为辅的混合模式,裂纹优先在碳化物/基体界面萌生;当温度升至980 ℃时,断裂机制转变为微孔聚集型韧性断裂,断后伸长率提升至8.8%。变形机制分析表明,低温区(<400 ℃)以层错剪切主导,形成Lomer-Cottrell位错锁;中温区(400~760 ℃)存在Portevin-Le Chatelier效应并伴随中温脆性特征;当温度超过760 ℃时,基体通道变宽和层错能增加促使变形机制转变为反相畴界(APB)剪切与Orowan绕过协同作用,导致变形抗力显著下降。

    Abstract:

    The Mar-M247 nickel-based superalloy turbine blade was investigated through tensile tests conducted from room temperature to 980 °C. The microstructure, tensile properties, and fracture mechanisms of the alloy were systematically analyzed. Results indicate that the alloy’s microstructure primarily consists of γ phase, flower-like γ′ phase, γ/γ′ eutectic structure, and carbide phases. The alloy strength initially increases and then decreases with rising temperature. At low temperatures, fracture exhibits a mixed mode dominated by transgranular fracture with intergranular fracture as a secondary component, where cracks preferentially initiate at carbide/matrix interfaces. When the temperature reaches 980 °C, the fracture mechanism transitions to microvoid coalescence-induced ductile fracture, accompanied by an increase in elongation to 8.8%. Deformation mechanism analysis reveals that stacking fault shearing dominates in the low-temperature region (<400 °C), forming Lomer-Cottrell dislocation locks. The intermediate temperature range (400–760 °C) displays Portevin-Le Chatelier effects coupled with intermediate-temperature brittleness. Above 760 °C, widening matrix channels and increased stacking fault energy promote a synergistic interaction between antiphase boundary (APB) shearing and Orowan bypassing mechanisms, leading to a significant decrease in deformation resistance.

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刘伟,隋永枫,姚世传,赵新宝,许佳晨,范云鹏,刘浩,岳全召,夏万顺,张泽. Mar-M247高温合金涡轮叶片微结构及拉伸性能研究[J].稀有金属材料与工程,,().[Liu Wei, Sui Yongfeng, Yao Shichuan, Zhao Xinbao, Xu Jiachen, Fan Yunpeng, Liu Hao, Yue Quanzhao, Xia Wanshun, Zhang Ze. Study on Microstructure and Tensile Properties of Mar-M247 Superalloy Turbine Blades[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2025-04-17
  • 最后修改日期:2025-05-12
  • 录用日期:2025-05-13
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