耿志杰,王善林,陈玉华,黄永德,信纪军,柯黎明,温涛涛,孙文君.激光增材制造GH3625高温合金激光焊接头组织及力学性能[J].稀有金属材料与工程,2020,49(7):2480~2487.[Geng Zhijie,Wang Shanlin,Chen Yuhua,Huang Yongde,Xin Jijun,Ke Liming,Wen Taotao,Sun Wenjun.Microstructure and mechanical properties of superalloy laser welded joints for GH3625 fabricated by laser additive[J].Rare Metal Materials and Engineering,2020,49(7):2480~2487.]
激光增材制造GH3625高温合金激光焊接头组织及力学性能
投稿时间:2019-06-23  修订日期:2019-09-02
中文关键词:  激光增材制造GH3625  激光焊  组织演变  力学性能
基金项目:国家自然科学基金(51865035);江西省优势科技创新团队项目(20171BCB24007);航空科学基金(2017ZE56010);
中文摘要:
      对激光增材制造GH3625高温合金进行激光对接焊实验,分析了焊接接头的显微组织演变规律和力学性能。结果表明,在热影响区,仅在上层晶界处析出大量Laves相,导致晶界发生明显粗化。沿焊缝上层至下层,熔合区和中间区由上层的胞状晶、柱状晶和等轴细晶逐渐转变为下层的柱状晶,且紧贴熔合线生长的等轴细晶的数量逐渐增多,中心区均为树枝晶。细小颗粒状γ′相弥散分布于焊缝;大量Laves相在中间区枝晶间析出,且形态由上层的条状逐渐转变为下层的颗粒状。接头抗拉强度为872MPa,达到母材抗拉强度的98.2%,伸长率达到母材的90.7%。接头断面近似呈45°斜面,断裂形式为脆性和韧性混合断裂方式。
Microstructure and mechanical properties of superalloy laser welded joints for GH3625 fabricated by laser additive
英文关键词:GH3625 superalloy fabricated by laser additive  laser welding  microstructure evolution  mechanical properties
英文摘要:
      The laser butt welding of GH3625 superalloy fabricated by laser additive was conducted. The microstructure evolution and mechanical properties of the welded joints were analyzed. The results show that a great amount of Laves phase was only precipitated at the grain boundary of upper layer in HAZ, resulting in significant coarsening of the grain boundary. Along the upper layer to the lower layer of the weld, the fusion zone and the intermediate zone are gradually transformed from cell crystal, the columnar crystal and the equiaxed fine crystal of the upper layer to columnar crystal of the lower layer. The number of equiaxed fine crystal growing close to the fusion line is gradually increased. And the central zone is dendritic. The particle of fine γ′ phase is precipitated in the weld. A number of Laves phase precipitates in the inter-dendrtic of the intermediate zone, and the morphology gradually changes from the strip of the upper layer to the particle of the lower layer. The tensile strength of the welded joint is 872 MPa, which is up to 98.2% of the base metal. The elongation is up to 90.7% of the base metal, the fracture surface of weld joint is approximately 45° inclined plane, and the fracture mode is the mixed fracture mode of brittle and ductile.
作者单位E-mail
耿志杰 南昌航空大学 轻合金加工科学与技术国防重点学科实验室 15170434735@163.com 
王善林 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
陈玉华 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
黄永德 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
信纪军 中国科学院等离子体物理研究所  
柯黎明 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
温涛涛 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
孙文君 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
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