718合金TIG焊热影响区组织变化

叶欣; 华学明; 吴毅雄

718合金TIG焊热影响区组织变化

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;上海市激光制造与材料改性重点实验室, 上海 200240

计量
- 文章访问数: 446
- HTML全文浏览量: 4
- PDF下载量: 216
出版历程
- 收稿日期: 2015-03-29

Microstructure evolution of HAZ of TIG welded Ni-based 718 superalloy

Welding Engineering and Technical Institute, Shanghai Jiao Tong University, Shanghai 200240, China;Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China

摘要

摘要: 以不同热输入对轧制、铸态、铸后均匀化热处理3种2.8 mm厚Inconel-718薄板进行TIG焊试验.观察各接头母材与HAZ(焊接热影响区)组织,分析热输入对3种母材接头HAZ晶粒结构、大小的影响.发现随热输入增大,轧制母材焊接接头HAZ沉淀相大量溶解,等轴晶晶粒长大明显,速度为铸态或均匀化接头4.6倍.铸态或均匀化母材呈树枝晶,晶粒较大;HAZ偏析区扩散消失,奥氏体成分趋于均匀,树枝晶结构痕迹减弱;沉淀相残留于原枝晶间位置,在抑制HAZ晶粒长大的同时,保留部分树枝晶结构痕迹;铸态母材焊接接头HAZ沉淀相多于均匀化接头,更接近树枝晶结构.
- 镍基718合金 /
- 热输入 /
- 热影响区 /
- 晶粒 /
- 偏析
Abstract: The effect of different heat input on HAZ microstructure evolution in TIG welding was studied on 2.8 mm Inconel-718 sheets with wrought, as-cast and homogenized conditions. It was investigated that the microstructure and the grain size of all base metal and HAZ of welding joints with different heat input. With the heat input increased, precipitates dissolved in large quantities and equiaxial grains grew greatly in HAZ of the wrought joints. On the other hand, segregated structure was dispersed and a large number of residual precipitates was kept in HAZ interdendritic area of as-cast and homogenization joints, consequently, dendritic structure converted to equiaxed austenite gradually because of the widened width of intradendritic matrix and grain grew slightly because of precipitates' pinning effect on grain boundary migration. There were more precipitates in as-cast joints HAZ than homogenized sheet's joint result in more dendritic structure feature.
- Inconel 718 /
- heat input /
- HAZ /
- grain /
- precipitates

HTML全文

参考文献(9)

[1]	Li R B, Yao M, Liu W C, et al. Isolation and determination for δ, γ' and γ" phases in Inconel 718 alloy[J]. Scripta Materialia, 2002, 46(9):635-638.
[2]	Chang S H. In situ TEM observation of γ', γ" and δ precipitations on Inconel 718 superalloy through HIP treatment[J]. Journal of Alloys and Compounds, 2009, 486(1/2):716-721.
[3]	Wang L, Li C Q, Dong J X, et al. An investigation of microsegregation and liquid density redistribution during solidification of Inconel 718[J]. Chemical Engineering Communications, 2009, 196(6):754-765.
[4]	Wang L, Yijun Y, Dong J X, et al. Effect of cooling rates on segregation and density variation in the mushy zone during solidification of superalloy Inconel 718[J]. Chemical Engineering Communications, 2010, 197(12):1571-1589.
[5]	Wang L, Gong H, Zhao H F, et al. Phase transformation and liquid density redistribution during solidification of Ni-based superalloy Inconel 718[J]. China Foundry, 2012, 9(3):263-268.
[6]	Antonsson T, Fredriksson H. The effect of cooling rate on the solidification of Inconel 718[J]. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2005, 36(1):85-96.
[7]	Huang X, Richards N L, Chaturvedi M C. Effect of grain size on the weldability of cast alloy 718[J]. Materials and Manufacturing Processes, 2004, 19(2):285-311.
[8]	张海泉,赵海燕,张彦华,等.镍基高温合金电子束焊接热影响区微裂纹特征分析[J].材料工程, 2005(3):22-25. Zhang Haiquan, Zhao Haiyan, Zhang Yanhua, et al. Analysis on the microfissuring behavior in the heat-affected zone of electron-beam welded nicke-based superalloy[J]. Journal of Materials Engineering, 2005(3):22-25.
[9]	韦志锋,罗肖邦.回复热处理对恢复锻造718合金焊接性能的影响[J].国外金属热处理, 2004, 25(2):17-22. Wei Zhifeng, Luo Xiaobang. The heat treatment effect on wrought 718 superalloy weldability[J]. Heat Treament of Metals Abroad, 2004, 25(2):17-22.

施引文献

资源附件(0)

计量

文章访问数: 446
HTML全文浏览量: 4
PDF下载量: 216
被引次数: 0

718合金TIG焊热影响区组织变化

计量

出版历程

Microstructure evolution of HAZ of TIG welded Ni-based 718 superalloy

计量

出版历程

目录