Effect of condensate corrosion on tensile and fatigue properties of brazed AISI 304L stainless steel joints using gold-base filler metal
Effect of condensate corrosion on tensile and fatigue properties of brazed AISI 304L stainless steel joints using gold-base filler metal
复制标题
凝结水腐蚀对金基填充金属钎焊 AISI 304L 不锈钢接头拉伸和疲劳性能的影响
DOI：
10.1016/j.prostr.2018.12.004
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Walther
中科院分区：
文献类型：
--
作者：
Schmiedt;Lingnau;Tillmann;Walther
由于钎焊接头必须在腐蚀性环境中承受静态和循环载荷，因此冷凝水腐蚀的影响很大。研究了VDA 230-214对AISI 304L/BAU-4钎焊接头力学性能的影响。拉伸和疲劳性能的显著和随时间变化的退化是在6周内确定的。在拉伸和疲劳试验中，采用数字图像相关技术和触发图像采集相结合的方法来评估小范围内的局部变形。在这里，随着应力水平的增加，计量器长度对应变值的影响越来越大，预腐蚀的钎焊接头的含缺口表面增强了应变值。利用扫描电子显微镜对疲劳和腐蚀疲劳损伤过程进行了评价。
As brazed joints have to resist static and cyclic loads in corrosive environments, the effect of a condensate corrosion acc. to VDA 230-214 on the mechanical properties of brazed AISI 304L/BAu-4 joints is investigated. A significant and time-dependent degradation of tensile and fatigue properties is determined over 6 weeks. For an evaluation of local deformations within the small area of the brazing seam, the digital image correlation technique in combination with a triggered image acquisition is used during tensile and fatigue tests. Here, an increasing influence of the gauge length on strain values is identified for increasing stress levels, enhanced by notch-containing surfaces of the pre-corroded brazed joints. Fatigue and corrosion fatigue damage processes are evaluated using scanning electron microscopy.