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超薄Hastelloy C-276脈沖激光焊接接頭的拉伸性能
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國家重點基礎研究發(fā)展計劃“973”項目(2009CB724307)


Tensile Properties of Weld Joint on Thin Hastelloy C-276 Sheet of Pulsed Laser Welding
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    摘要:

    采用脈沖激光焊接技術(shù)實現(xiàn)了0.5 mm 厚度Hastelloy C-276屏蔽套材料對焊連接，得到的焊縫寬度小于1 mm，分析了焊接接頭的拉伸性能，同時采用微區(qū)XRD分析了拉伸斷口Hastelloy C-276相變特征。結(jié)果表明：焊接接頭的屈服極限相對于母材并未改變；而抗拉強度有一定程度的降低，為母材的88.6%，在斷口處并未發(fā)現(xiàn)明顯脆性相。焊接接頭的屈服極限與母材基本相當，主要由于焊縫處的晶粒細化效果提高了材料的屈服極限，起到了與母材固溶強化作用相似的作用；而焊接接頭抗拉強度的降低主要是由于拉伸過程更利于產(chǎn)生應力集中，促進微觀裂紋的形成，進而加速材料的破壞。

    Abstract:

    The pulsed laser welding of 0.5 mm thick Hastelloy C-276 was carried out and the weld joint with less than 1 mm width was obtained, and then the tensile test and XRD analysis were conducted. The results indicate that the yield strength of as-welded sample is nearly the same as that of the base metal, and the tensile strength is just 88.6% of that of the base metal. In the fracture, the enrichment of brittle phase isn’t found. Their comparable yield strength is due to the similar effect of solution strengthening of the base metal and grain refining of the as-welded sample. The reduced tensile strength of the welded sample is attributed to the favorable formation of micro-fracture during the tensile test.

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馬廣義,吳東江,郭玉泉,高忠民,郭東明.超薄Hastelloy C-276脈沖激光焊接接頭的拉伸性能[J].稀有金屬材料與工程,2013,42(6):1241~1245.[Ma Guangyi, Wu Dongjiang, Guo Yuquan, Gao Zhongmin, Guo Dongming. Tensile Properties of Weld Joint on Thin Hastelloy C-276 Sheet of Pulsed Laser Welding[J]. Rare Metal Materials and Engineering,2013,42(6):1241~1245.]
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  • 收稿日期:2012-06-10
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