镍基Inconel-718合金TIG焊部分熔化区组织变化<sup>*</sup>

doi:10.11900/0412.1961.2013.00753

金属学报

2014, Vol. 50

Issue (8): 1003-1010 DOI: 10.11900/0412.1961.2013.00753

本期目录 | 过刊浏览

镍基Inconel-718合金TIG焊部分熔化区组织变化^*

叶欣^1,², 华学明^1,²(

), 王敏^1,², 楼松年^1,²

1 上海交通大学材料科学与工程学院焊接工程技术研究所, 上海 200240
2 上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240

MICROSTRUCTURE EVOLUTION OF PARTIALLY MELTED ZONE OF TIG WELDING JOINT OF Ni-BASED INCONEL-718 SUPERALLOY

YE Xin^1,², HUA Xueming^1,²(

), WANG Min^1,², LOU Songnian^1,²

1 Welding Engineering Institute, College of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
2 Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240

引用本文:

叶欣, 华学明, 王敏, 楼松年. 镍基Inconel-718合金TIG焊部分熔化区组织变化^*[J]. 金属学报, 2014, 50(8): 1003-1010.
Xin YE, Xueming HUA, Min WANG, Songnian LOU. MICROSTRUCTURE EVOLUTION OF PARTIALLY MELTED ZONE OF TIG WELDING JOINT OF Ni-BASED INCONEL-718 SUPERALLOY[J]. Acta Metall Sin, 2014, 50(8): 1003-1010.

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摘要:

以轧制态、铸态、铸后均匀化三种状态的Inconel-718镍基合金薄板为对象, 进行钨极氩弧焊(TIG)接头部分熔化区(PMZ)的研究. 通过OM, SEM, EDS等手段观测不同焊接线能量下PMZ的微观组织. 通过EDS测得晶内奥氏体、偏析区、Laves相的合金元素含量后, 采用热力学软件Themo-Calc计算其理论固液相线温度, 比较当母材状态不同时焊接接头PMZ各相的液化及凝固温度, 分析液膜存在的温度范围大小. 结果表明, Inconel-718镍基合金TIG焊接接头PMZ存在微观组织遗传性, 铸态、铸后均匀化接头PMZ中仍然保持树枝晶的结构特征, 而轧制态接头PMZ中仍是等轴晶. 接头PMZ中皆析出链状Laves和颗粒状MC相, 母材中原有偏析区消失. 铸态母材固液相线间距最大, 铸后均匀化的次之, 轧制态的最小. 当母材状态、几何尺寸相同时, 随着焊接线能量的增加, PMZ宽度增大. 当焊接线能量相同时, 铸态PMZ宽度大于铸后均匀化和轧制态PMZ宽度.

关键词 ：镍基Inconel-718合金, PMZ, 偏析, 液膜, 树枝晶

Abstract：

Element segregation, such as Nb in Ni-based Inconel-718 superalloy, causes the precipitation of low melting point phase during solidification. The actual base metal can melt in a lower temperature and the structural continuity is damaged during welding thermo cycle curve. The liquid film easily generates between austenite grains and leads to stress concentration before solidifying into the low melting point phase. Microstructure evolution of Inconel-718 welding joint increases the hot crack sensitivity and changes mechanical property of the joint. The partially melted zone (PMZ) is close to the molten metal in the fusion zone, which is the most liquation crack sensitive region of welding joint heat affected zone (HAZ). Different microstructures exists among wrought, as-cast and homogenization Inconel-718 superalloy inducing weldability differences of these material. Especially, the solidus-liquidus curve differences of low melting point phase in PMZ notably affect the high temperature mechanical property of welding joint. The wrought, as-cast and homogenization Inconel-718 superalloy sheets were respectively welded by tungsten inert gas arc welding (TIG) with different heat inputs. The microstructure of PMZ was observed by OM and SEM. Alloy element content of intradendritic austenite, interdendritic segregated region and Laves phase was investigated by EDS. The theoretical solidus-liquidus temperature of these phases was calculated by Thermo-Calc software. The melting and solidification temperature of austenite and Laves in PMZ of different base metal was investigated to analyze the temperature range for the formulation of liquid film. The results show that the microstructure heredity phenomenon obviously exists in the PMZ of Inconel-718 welding joint. The equiaxed grains remain in the PMZ of wrought joint, and the dendritic structure is still kept in the PMZ of as-cast and homogenization joint. The slender Laves and particle MC phase precipitate along the boundary of the austenite in PMZ of welding joint. But the segregated region originally existed in base metal disperses. The calculating results show that the maximum solidus-liquidus temperature range is in as-cast base metal, secondary in homogenization, minimum in wrought. The width of PMZ is increased with the increasing heat input and PMZ of as-cast is larger than PMZ of wrought and homogenization Inconel-718 superalloy.

Key words： Ni-based Inconel-718 superalloy PMZ segregation liquid film dendrite

收稿日期: 2013-11-21

ZTFLH:

TG401

作者简介: null

叶欣, 男, 1984年生, 博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2013.00753 或 https://www.ams.org.cn/CN/Y2014/V50/I8/1003

图1 焊接接头示意图

图2 Inconel-718合金轧制态母材的微观组织

图3 Inconel-718合金轧制态接头的微观组织

图4 Inconel-718合金铸态母材的微观组织

图5 Inconel-718合金铸态接头的微观组织

图6 Inconel-718合金均匀化状态母材的微观组织

图7 Inconel-718合金均匀化接头的微观组织

表1 不同焊接线能量下3种状态的Inconel-718合金接头PMZ宽度

图8 Inconel-718合金相平衡分数图

图9 Inconel-718合金元素平衡相图

表2 Inconel-718合金铸态与均匀化的母材和PMZ区域元素含量与理论固液相线温度

表3 Inconel-718合金母材固液相线理论温度及其固液共存温度区间

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