Characterisation of microstructure, defect and high-cycle-fatigue behaviour in a stainless steel joint processed by brazing
作者： Y. Li , X. Zhang , D. Parfitt , S. Jones , B. Chen
DOI: 10.1016/J.MATCHAR.2019.03.042
关键词:
摘要: Abstract We report the characterisation of microstructures and high-cycle-fatigue (HCF) properties Type 304 stainless steel joints processed by brazing. Pure copper was applied as filler metal for brazing at 1120 °C. A two-phase microstructure obtained within joint region: star-shaped precipitates matrix. The with an average size 0.43 μm were rich in iron chromium. fixed orientation relationship found between exhibited much higher tensile strength HCF life when compared to pure copper. enhancement can be attributed presence precipitates. Furthermore, effect interface roughness well defects critically investigated. showed little influence on lives. Post-examinations revealed that fatigue crack initiation propagation occurred entirely region, hence being consistent similar lives regardless pre-defined conditions. In addition, it decreased exponentially increase initial defect area. Fractography analysis striation spacings near zone increased area, suggesting larger result growth rate, shorten overall life.
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