Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Microstructure and Mechanical Property of Brazed Joint in Duplex Stainless Steel, UNS32550

브레이징한 2상 스테인리스강 UNS32550의 미세조직 및 기계적 특성

  • Published : 2003.04.01
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Abstract

The bonding phenomena and mechanical property of duplex stainless steel during brazing have been investigated. The UNS32550 was used for base metal, and the MBF50 was used for insert metal. Brazing was carried out under the various conditions (brazing temperature : 1473K, 1498K, holding time : 0∼1.8ks). There were various microconstituents in the bonded interlayer because of reaction between liquid insert metal and base metal. In the early stage of brazing, BN is formed in the bonded interlayer and base metal near the bonded layer. Cr made is formed in the bonded interlayer. The amount of BN and Cr nitrides decrease with the increase of bonding temperature and holding time. Superior shear strength of 550MPa is obtained by restraining the formation of nitrides. (Received January 17, 2003)

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