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金属学报  2019, Vol. 55 Issue (9): 1221-1230    DOI: 10.11900/0412.1961.2019.00097
  研究论文 本期目录 | 过刊浏览 |
DD407/IN718高温合金异质焊接接头的组织及高温变形行为
刘杨,王磊(),宋秀,梁涛沙
东北大学材料各向异性与织构教育部重点实验室 沈阳 110819
Microstructure and High-Temperature Deformation Behavior of Dissimilar Superalloy Welded Joint of DD407/IN718
LIU Yang,WANG Lei(),SONG Xiu,LIANG Taosha
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
全文: PDF(30541 KB)   HTML
摘要: 

采用连续光纤激光器对DD407单晶、IN718多晶高温合金实施对接焊,研究了标准热处理前后接头微观组织、成分偏析的演化及接头的高温拉伸变形行为。结果表明,在优化焊接参数下,接头熔合区组织包括平面晶区、胞状晶区、柱状晶区和等轴晶区,熔合区中心线两侧枝晶生长形态差异明显。焊接态接头熔合区硬度低,存在明显的微观偏析;标准热处理后,熔合区偏析得以改善,接头熔合区硬度超过两侧母材硬度。接头单晶热影响区存在局部硬化区,多晶热影响区存在较窄的软化区及晶界液化现象。接头在650 ℃拉伸时,抗拉强度达1111 MPa,延伸率可达9.42%,断裂位置位于多晶母材侧。接头高温拉伸塑性变形方式主要为单晶母材、熔合区的位错多系滑移以及多晶母材的位错滑移和晶界滑动,拉伸断口呈多源开裂特征,裂纹源区存在韧窝和冰糖状断口形貌。接头多晶侧热影响区的晶界液化并未对接头短时高温力学性能产生明显影响。

关键词 光纤激光焊接单晶/多晶异质金属焊接接头微观偏析高温变形断裂行为    
Abstract

Welding is an important joining method to fabricate the dissimilar welding integral blisk structure of single crystal and polycrystalline superalloy. The microstructure and properties of the welded joint are the key factors to determine the reliability of the integral blisk structure of dissimilar superalloys. The single crystal superalloy of DD407 and polycrystalline superalloy of IN718 were butt welded by continuous fiber laser system. The evolution of microstructure and composition segregation of the welded joints fabricated under the optimized welding parameters as-welded (AW) and after post weld heat treatment (PWHT) were investigated. The high temperature tensile deformation behavior of the welded joint after PWHT was also examined. The results show that the microstructures of fusion zone (FZ) in the welded joint consist of planar crystal, cellular crystal, columnar crystal and equiax crystal. The difference of the dendrite microstructures between the two sides of the weld centerline is very obvious. In terms of the joint as-welded, the microhardness of the FZ is low and there exists obvious micro-segregation. After PWHT, the micro-segregation has been improved and the microhardness increases significantly in the FZ which is much more than those of both base metals (BMs) of DD407 and IN718 alloys. There exists local hardening zone in the heat-affected zone (HAZ) of DD407 single crystal alloy and narrow softening zone and grain boundary liquation phenomenon in the HAZ of IN718 polycrystalline alloy. The ultimate tensile strength and elongation of the welded joint after tensile test at 650 ℃ are 1111 MPa and 9.42%, respectively. And the tensile specimen of the welded joint fails in the BM of IN718 polycrystalline alloy. The main deformation mode of the laser welded joint at high temperature includes the multi-slips of dislocation in the BM and FZ of single crystal alloy, and the dislocation slip and grain-boundary sliding in the BM of polycrystalline alloy. The tensile fracture surface is characterized by multi-source cracking, and the dimple and crystal sugar shaped facture surface exist simultaneously in the crack source area, which is a mixed fracture of microvoid aggregation and intergranular fracture. So the tensile fracture mechanism contains micro-void accumulation fracture and inter-granular fracture. The grain boundary liquefaction in the HAZ of IN718 polycrystalline does not affect the short-time high temperature mechanical properties of the welded joints.

Key wordsfiber laser welding    dissimilar welded joint of single crystal and polycrystalline alloy    dissimilar welded joint of single crystal and polycrystalline alloymicro-segregation    high-temperature deformation    fracture behavior
收稿日期: 2019-04-03     
ZTFLH:  TG132.32  
基金资助:国家自然科学基金项目(Nos.51571052、 U1708253,51874090);中央高校基本科研业务费专项资金项目(No.180213006)
通讯作者: 王磊     E-mail: wanglei@mail.neu.edu.cn
Corresponding author: Lei WANG     E-mail: wanglei@mail.neu.edu.cn
作者简介: 刘 杨,男,1978年生,副教授,博士

引用本文:

刘杨,王磊,宋秀,梁涛沙. DD407/IN718高温合金异质焊接接头的组织及高温变形行为[J]. 金属学报, 2019, 55(9): 1221-1230.
Yang LIU, Lei WANG, Xiu SONG, Taosha LIANG. Microstructure and High-Temperature Deformation Behavior of Dissimilar Superalloy Welded Joint of DD407/IN718. Acta Metall Sin, 2019, 55(9): 1221-1230.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00097      或      https://www.ams.org.cn/CN/Y2019/V55/I9/1221

MaterialCCrCoWMoAlTiNbTaFeNi
DD4070.0078.0505.5005.0002.2505.9502.000-3.500-Bal.
IN7180.04019.000--3.0500.5000.9005.250-Bal.52.500
表1  DD407单晶合金、IN718多晶合金的化学成分
图1  DD407/IN718合金激光焊接接头拉伸变形取样尺寸示意图
图2  不同焊接参数下DD407/IN718合金激光焊接接头上、下表面及截面宏观形貌
图3  DD407/IN718合金激光焊接接头(聚焦镜焦距250 mm,离焦量-8 mm,焊接功率1600 W,焊接速率2.1 mm/min)的焊接态显微组织
图4  标准热处理后DD407/IN718合金激光焊接接头的SEM像
图5  热处理前后接头的显微硬度分布
图6  DD407/IN718接头的合金元素分布
图7  DD407/IN718接头和2种母材的应力-应变曲线及拉伸性能
图8  DD407/IN718接头和母材拉伸后的截面形貌及断口SEM像
图9  DD407/IN718接头高温拉伸断口截面SEM像
图10  DD407/IN718接头高温拉伸断口处的SEM像
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