单晶DD3与细晶GH4169高温合金摩擦焊接界面表征<sup>*</sup>

doi:10.11900/0412.1961.2014.00686

金属学报

2015, Vol. 51

Issue (8): 951-956 DOI: 10.11900/0412.1961.2014.00686

本期目录 | 过刊浏览

单晶DD3与细晶GH4169高温合金摩擦焊接界面表征^*

杜随更(

),王喜锋,高漫

CHARACTERISTICS OF THE FRICTION WELDING INTERFACE BETWEEN SINGLE CRYSTAL SUPERALLOY DD3 AND FINE GRAINED SUPERALLOY GH4169

Suigeng DU(

),Xifeng WANG,Man GAO

Key Laboratory of Ministry of Education for Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072

引用本文:

杜随更,王喜锋,高漫. 单晶DD3与细晶GH4169高温合金摩擦焊接界面表征^*[J]. 金属学报, 2015, 51(8): 951-956.
Suigeng DU, Xifeng WANG, Man GAO. CHARACTERISTICS OF THE FRICTION WELDING INTERFACE BETWEEN SINGLE CRYSTAL SUPERALLOY DD3 AND FINE GRAINED SUPERALLOY GH4169[J]. Acta Metall Sin, 2015, 51(8): 951-956.

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摘要:

采用SEM, TEM及EDS对制造焊接式整体涡轮叶盘所用的单晶DD3与细晶GH4169高温合金摩擦焊接界面进行了研究. 结果表明, 焊合区存在一条以GH4169合金为主的摩擦变形带, 两侧单晶和细晶合金的热力影响区均形成了动态再结晶晶粒; 连接界面处于两侧合金的动态再结晶晶粒之间, 通过连接界面上的共有晶粒和共有晶界实现了两侧合金的连接; 成分过渡主要发生在连接界面处的共有晶粒内和共有晶界处. TEM分析位置的共有晶粒(C2)与相邻GH4169动态再结晶晶粒(C3)具有特殊的取向关系: [1ˉ14]_C2 ∥ [1ˉ10]_C3 和(220)_C2 ∥ (220)_C3; 在摩擦焊热循环及焊后热处理作用下, 共有晶粒、两侧动态再结晶晶粒都存在g' 相析出, g' 相呈细小的球形分布, 并与g基体共格, 但未发现有g" 相析出.

关键词 ：单晶高温合金, 高温合金, 摩擦焊, 连接机理, 共有晶粒

Abstract：

Due to high demand of welded turbine blisk, a fine grain superalloy, GH4169, has been widely used to make the disk and a single crystal superalloy, DD3, has been used for blades. In this work, the joint micro-structure and the mechanism of friction welding between the GH4169 and DD3 have been investigated by using the SEM and TEM equipped with EDS. The research results show that there is a friction deformed band of the GH4169 in the weld zone. The heat and mechanical affected zones of the two alloys form dynamic recrystallization grains. The bonding interface is between their dynamic recrystallization grains. The two alloys bond with the common grains and the common grain boundaries. Their compositional change mainly occurs within the common grains and the common grain boundaries at bonding interface. The common grain (C2) at the viewpoint of TEM analysis and adjacent dynamic recrystallization grain (C3) of the GH4169 has a specific orientation relationship, [1ˉ14]_C2 ∥ [1ˉ10]_C3 , (220)_C2 ∥ (220)_C3. With the friction welding thermal cycles and post weld heat treatment, the g' phase precipitates with tiny spherical distribution at the common grain and the two sides of dynamic recrystallization grains, and coherent with g matrix. But no g" phase precipitates.

Key words： single crystal superalloy friction welding bonding mechanism common grain

基金资助:*国家自然科学基金资助项目51175430

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00686 或 https://www.ams.org.cn/CN/Y2015/V51/I8/951

表1 实验用合金的化学成分

图1 DD3与GH4169合金摩擦焊接焊合区的SEM像

图2 DD3与GH4169合金摩擦焊接焊合区共有晶界SEM像及EDS分析

图3 DD3与GH4169合金摩擦焊接焊合区共有晶粒SEM像及EDS分析

图4 DD3与GH4169合金摩擦焊接焊合区的TEM像及EDS分析

图5 DD3与GH4169合金摩擦焊接焊合区TEM/SAED分析

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