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Hastelloy C-276薄板激光焊接接头疲劳性能

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Indexed by:期刊论文

Date of Publication:2016-12-15

Journal:中国有色金属学报

Included Journals:PKU、ISTIC、CSCD、EI、Scopus

Volume:26

Issue:12

Page Number:2555-2563

ISSN No.:1004-0609

Key Words:Hastelloy C-276;激光焊接;薄板;疲劳性能

Abstract:对0.5 mm厚Hastelloy C?276薄板激光焊接接头进行疲劳试验,结合应力?寿命(S?N)曲线和疲劳断口形貌,研究母材及焊接接头的疲劳性能,分析母材和焊接接头的疲劳断裂机理。结果表明:0.5 mm Hastelloy C?276薄板焊接接头和母材的S?N曲线斜率基本相同,焊接接头疲劳性能和母材的基本相当;母材疲劳断口疲劳裂纹起源于试样侧表面,主要沿宽度方向扩展,随着应力的减小,疲劳源数目减少,疲劳裂纹扩展速率减小;焊接接头在母材和焊缝处随机断裂,焊接接头母材区断口形貌和母材断口形貌基本一致,而焊接接头焊缝区断口的疲劳裂纹起源于侧表面棱角处和焊缝表面,焊缝表面是主要疲劳源,裂纹主要沿厚度方向进行扩展,疲劳裂纹扩展区呈现出准解理断裂特征。

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