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首页> 美国卫生研究院文献>Materials >Fatigue and Corrosion Fatigue Behaviour of Brazed Stainless Steel Joints AISI 304L/BAu-4 in Synthetic Exhaust Gas Condensate
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Fatigue and Corrosion Fatigue Behaviour of Brazed Stainless Steel Joints AISI 304L/BAu-4 in Synthetic Exhaust Gas Condensate

机译：钎焊不锈钢接头AISI 304L / BAu-4在合成废气冷凝物中的疲劳和腐蚀疲劳行为

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摘要

As brazed stainless steel components in service often have to withstand cyclic loads in corrosive environments, the corrosion fatigue properties of brazed joints have to be characterised. Application-relevant corrosion fatigue tests in corrosive media are extremely rare for brazed joints and cyclic deformation curves are barely investigated. In this study, fatigue tests of brazed AISI 304L/BAu-4 joints were performed in air and synthetic exhaust gas condensate K2.2 according to VDA 230-214. The fatigue behaviour of the brazed joints was compared to properties of the austenitic base material. Strain, electrical, magnetic, temperature and electrochemical measurement techniques were applied within fatigue and corrosion fatigue tests to characterise the cyclic deformation and damage behaviour of the brazed joints. It was found that the fatigue strength of 397 MPa at 2 × 106 cycles was reduced down to 51% due to the superimposed corrosive loading. Divergent microstructure-related damage mechanisms were identified for corrosion fatigue loadings and fatigue loadings of specimens in the as-received and pre-corroded conditions. The investigations demonstrate the important role of corrosive environments for the mechanical performance of brazed stainless steel joints.
机译：由于使用中的钎焊不锈钢部件通常必须在腐蚀性环境中承受循环载荷，因此必须表征钎焊接头的腐蚀疲劳性能。对于钎焊接头，在腐蚀性介质中进行与应用相关的腐蚀疲劳试验是极为罕见的，并且很少研究循环变形曲线。在这项研究中，根据VDA 230-214，在空气和合成废气冷凝液K2.2中进行了钎焊AISI 304L / BAu-4接头的疲劳测试。将钎焊接头的疲劳性能与奥氏体基础材料的性能进行了比较。在疲劳和腐蚀疲劳测试中应用了应变，电，磁，温度和电化学测量技术，以表征钎焊接头的周期性变形和损伤行为。结果发现，由于叠加的腐蚀负荷，在2×10 6 循环下的397 MPa疲劳强度降低到51％。确定了与微观结构相关的不同损伤机理，以用于在接收和预腐蚀条件下的腐蚀疲劳载荷和试样的疲劳载荷。研究表明，腐蚀环境对钎焊不锈钢接头的机械性能具有重要作用。

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