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薄片狀TiNi合金/不銹鋼激光微焊接接頭組織特征
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現(xiàn)代焊接生產技術國家重點實驗室開放課題 (200803); 江西省自然科學基金項目 (2007GQC1513)


Microstructure Characteristics of Laser Micro Welding Joint between TiNi Shape Memory Alloy Sheet and Stainless Steel Sheet
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    摘要:

    采用微型脈沖激光對0.2 mm厚的薄片狀TiNi形狀記憶合金/不銹鋼異種材料進行對接焊，研究了接頭的微觀組織特征。結果表明，以純Ni絲為填充材料、以微型脈沖激光為熱源可以實現(xiàn)TiNi合金/不銹鋼異種材料的良好焊接。焊縫中心區(qū)為細小的等軸晶組織，主要元素為Ti、Ni、Fe。Ti元素的含量和不銹鋼母材基本接近， Ni元素的含量略高于TiNi合金母材，遠高于不銹鋼母材，但TiNi合金母材一側基本沒有Fe元素。TiNi合金母材與焊縫之間存在明顯的界面區(qū)，寬度為10～20 μm，界面區(qū)有從不銹鋼母材擴散而來的Fe、Cr元素。不銹鋼母材與焊縫之間界面區(qū)的寬度較小，表現(xiàn)為界面線

    Abstract:

    Dissimilar materials of TiNi shape memory alloy (SMA) and stainless steel of 0.2 mm thickness were butt welded by micro impulse laser and the microstructure characteristics of the weld joint were studied. The results show that good joining between TiNi SMA and stainless steel can be realized with pure Ni wire as filler material and micro impulse laser as welding heat source. The microstructures of weld center are fine equiaxed crystals and the main elements in weld seam are Ti, Ni and Fe. In weld seam, the content of Ti is similar to that of stainless steel base metal, while Ni is a little more than that of TiNi SMA base metal and much more than that of stainless steel base metal. There is little Fe element in TiNi SMA base metal. There is an obvious interfacial zone of about 10-20 μm width between TiNi SMA base metal and the weld, and there are Fe and Cr elements in the interfacial zone, which diffuse from stainless steel base metal. The width of the interfacial zone between stainless steel base metal and the weld is small and the interface is a line

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陳玉華,龔偉懷,倪 泉,柯黎明.薄片狀TiNi合金/不銹鋼激光微焊接接頭組織特征[J].稀有金屬材料與工程,2011,40(11):2026~2029.[Chen Yuhua, Gong Weihuai, Ni Quan, Ke Liming. Microstructure Characteristics of Laser Micro Welding Joint between TiNi Shape Memory Alloy Sheet and Stainless Steel Sheet[J]. Rare Metal Materials and Engineering,2011,40(11):2026~2029.]
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  • 收稿日期:2010-11-28
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