第二、三代镍基单晶高温合金含Hf过渡液相连接<sup>*</sup>

doi:10.11900/0412.1961.2015.00408

金属学报

2016, Vol. 52

Issue (5): 549-560 DOI: 10.11900/0412.1961.2015.00408

论文

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第二、三代镍基单晶高温合金含Hf过渡液相连接^*

郁峥嵘¹,丁贤飞²,曹腊梅³,郑运荣¹,冯强^1,⁴(

)

1 北京科技大学新金属材料国家重点实验室, 北京100083
2 北京科技大学国家材料服役安全科学中心, 北京 100083
3 北京航空材料研究院先进高温结构材料重点实验室, 北京100095
4 北京科技大学高端金属材料特种熔炼与制备北京市重点实验室, 北京 100083

TRANSIENT LIQUID PHASE BONDING OF SECOND AND THIRD GERNERATION Ni-BASED SINGLE CRYSTAL SUPERALLOY WITH Hf-CONTAININGINTERLAYER ALLOY

Zhengrong YU¹,Xianfei DING²,Lamei CAO³,Yunrong ZHENG¹,Qiang FENG^1,⁴(

)

1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2 National Centre for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
3 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
4 Beijing Key Laboratory of Special Melting and Reparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

郁峥嵘,丁贤飞,曹腊梅,郑运荣,冯强. 第二、三代镍基单晶高温合金含Hf过渡液相连接^*[J]. 金属学报, 2016, 52(5): 549-560.
Zhengrong YU, Xianfei DING, Lamei CAO, Yunrong ZHENG, Qiang FENG. TRANSIENT LIQUID PHASE BONDING OF SECOND AND THIRD GERNERATION Ni-BASED SINGLE CRYSTAL SUPERALLOY WITH Hf-CONTAININGINTERLAYER ALLOY[J]. Acta Metall Sin, 2016, 52(5): 549-560.

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摘要:

采用无B的含Hf镍基合金作为中间层合金, 分别对含Re的第二代镍基单晶高温合金 (CMSX-4, 铸态) 和第三代镍基单晶高温合金(SXG3, 完全热处理态)进行过渡液相(TLP)连接, 并分析了连接区的显微组织演变以及降熔元素分布, 测试了连接区的显微硬度. 结果表明, 在1290 ℃真空保温24 h后, CMSX-4和SXG3合金的TLP连接均已完成, 2种合金的TLP连接过程也均符合经典模型. 以含Hf的镍基合金作为中间层合金时, 在连接区内没有出现扩散影响区. CMSX-4合金的固溶处理可在TLP连接过程中同步完成, 缩短了热处理工艺. SXG3合金中的C与Hf结合在液相中形成固相HfC, 降低熔体中Hf浓度, 缩短了等温凝固阶段的时间. 研究表明, 通过含Hf的TLP连接可以研究小角度晶界的界面稳定性, 其中在1150 ℃保温热处理后, SXG3合金小角度晶界出现不连续脱溶转变的临界区间在10°~17°之间.

关键词 ：镍基单晶高温合金, TLP连接, 含Hf中间层合金, 显微组织

Abstract：

A Hf-containing Ni-based alloy was used as the interlayer alloy of TLP bonding for the 2nd (CMSX-4, as-cast condition) and 3rd (SXG3, standard heat treatment condition) generation Ni-based single crystal superalloys containing Re in this work, and the microstructure, composition and micro-hardness of bonding zone were characterized. The results show that the TLP bonding of CMSX-4 and SXG3 alloy were completed after bonded at 1290 ℃ in vacuum for 24 h. These TLP bonding process of CMSX-4 and SXG3 alloys can be explained well using classical TLP model. The diffusion affected zone was not observed during the TLP bonding process. In addition, the heat treatment process of CMSX-4 is shortened by 24 h resulted from the solid solution heat treatment of CMSX-4 alloy has been completed after the process of TLP bonding. The isothermal solidification stage of SXG3 alloy was also accelerated due to the precipitation of HfC at the bonding temperature, resulting in the reduced Hf concentration of Hf in the melting zone. This work also indicates that the interfacial stability of low angle grain boundaries can be investigated by the TLP bonding. The critical misorientation value for discontinuous precipitation of SXG3 alloy along TLP bonding grain boundaries by Hf-containing interlayer alloy was in between 10° and 17° after heat treatment at 1150 ℃.

Key words： Ni-based single crystal superalloy TLP bonding Hf-containing interlayer alloy microstructure

收稿日期: 2015-07-23

基金资助:* 国家自然科学基金项目 51071016, 国家高技术研究发展计划项目2012AA03A511和教育部技术支撑重点项目625010337资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00408 或 https://www.ams.org.cn/CN/Y2016/V52/I5/549

表1 合金的名义成分

图1 过渡液相(TLP)连接的试样装配示意图

图2 CMSX-4合金经1290 ℃保温不同时间后基体合金和TLP连接区的SEM像

图3 CMSX-4合金经1290 ℃保温后, MZ平均宽度和Ni5Hf相在TLP的MZ中相含量与保温时间的关系

表2 CMSX-4合金经1290 ℃保温15 min后TLP连接MZ中Ni5Hf相和共晶团边缘γ'相的平均成分

图4 CMSX-4合金经1290 ℃保温15 min后TLP连接区的SEM像及γ+γ'共晶团中Hf元素分布

图5 CMSX-4合金经1290 ℃保温6和24 h后TLP连接区及附近基体合金中Hf元素的浓度分布

图6 CMSX-4合金经1290 ℃保温24 h后垂直于TLP连接界面的纳米压痕路径区域硬度和弹性模量

图7 SXG3合金经1290 ℃保温不同时间后TLP连接区的SEM像

图8 SXG3合金经1290 ℃保温6 h并淬火后TLP连接区的SEM像

图9 经TLP连接后SXG3合金的OM像及该连接试样经1150 ℃保温热处理5和25 h后的SEM像

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