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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A comprehensive numerical stress-strain analysis of laser beam butt-welded titanium compared with austenitic steel joints
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A comprehensive numerical stress-strain analysis of laser beam butt-welded titanium compared with austenitic steel joints

机译：激光束对焊钛与奥氏体钢接头的综合数值应力-应变分析

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摘要

Experimental tests on laser beam butt-welded joints made of commercially pure titanium and Ti-6A1-4V alloy showed a fatigue behaviour quite different from that usually observed in the case of AISI 304 joints connected with the same welding technique. In fact, fatigue failures of titanium joints were observed at the level of the base material but not in the notch region, as have been found for austenitic steel. In order to explain this experimental evidence, very detailed finite element models are developed in this paper. The models reproduce the real cord profiles of Ti-6A1-4V and AISI 304 steel welded joints detected by a high-precision coordinate measuring machine. Furthermore, mechanical properties given as input to the finite element models correspond to the real joint microstructure revealed by micro-hardness tests carried out in the different regions of the specimen. Finally, finite element models reproduce the distribution of porosity detected via microscopic inspection of the fractured surfaces. Interactions of weld geometry, material properties, presence/absence of porosity, and level of applied stress are considered in this study, which includes nine different finite element models of titanium and austenitic steel joints. A relevant complication in the analysis of titanium joints is represented by the small thickness and stress concentration effects.rnNumerical results show that the stress field in titanium joints is sensitive to the combined effect of weld seam geometry and presence of welding defects (pores). The latter produces stress concentration much more severe than that caused by the weld cord. Microstructural support length evaluated near the pores of titanium joints is about the same as that computed near the notch of austenitic steel joints (i.e. near 0). Furthermore, the Topper parameter evaluated for the titanium joints in the presence of pores is much smaller than for the stainless steel joints. Microstructure modifications must be accounted for in order to assess correctly the fatigue behaviour of austenitic steel joints.
机译：对由商业纯钛和Ti-6A1-4V合金制成的激光对接焊缝进行的实验测试表明，疲劳性能与通常采用相同焊接技术连接的AISI 304接头的疲劳性能完全不同。实际上，与奥氏体钢一样，在基体材料处观察到钛接头的疲劳失效，但在缺口区域未观察到。为了解释该实验证据，本文开发了非常详细的有限元模型。这些模型再现了由高精度坐标测量机检测到的Ti-6A1-4V和AISI 304钢焊接接头的真实帘线轮廓。此外，作为输入到有限元模型的机械性能对应于在试样的不同区域进行的显微硬度测试所揭示的真实的接头微观结构。最后，有限元模型重现了通过微观检查断裂表面而检测到的孔隙度分布。在这项研究中，考虑了焊接几何形状，材料特性，是否存在孔隙以及施加的应力水平之间的相互作用，其中包括九种不同的钛和奥氏体钢接头的有限元模型。较小的厚度和应力集中效应代表了钛接头分析中的一个相关复杂问题。数值结果表明，钛接头的应力场对焊缝几何形状和焊接缺陷（孔）的综合作用敏感。后者产生的应力集中比由焊接线引起的应力集中要严重得多。在钛接头的孔附近评估的微结构支撑长度与在奥氏体钢接头的缺口附近（即接近0）计算的支撑长度大致相同。此外，在存在孔的情况下对钛接头进行的Topper参数评估比与不锈钢接头相比要小得多。为了正确评估奥氏体钢接头的疲劳行为，必须考虑微观组织的变化。

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