The Effect of Post-Bond Heat Treatment on Tensile Property of Diffusion Bonded Austenitic Alloys

확산 접합된 오스테나이트계 재료의 인장특성에 미치는 후열처리의 영향

Hong, Sunghoon;Kim, Sung Hwan;Jang, Changheui;Sah, Injin

  • Received : 2015.06.13
  • Accepted : 2015.10.14
  • Published : 2015.12.01


Diffusion bonding is the key manufacturing process for the micro-channel type heat exchangers. In this study, austenitic alloys such as Alloy 800HT, Alloy 690, and Alloy 600, were diffusion bonded at various temperatures and the tensile properties were measured up to $650^{\circ}C$. Tensile ductility of diffusion bonded Alloy 800HT was significantly lower than that of base metal at all test temperatures. While, for Alloy 690 and Alloy 600, tensile ductility of diffusion bonded specimens was comparable to that of base metals up to $500^{\circ}C$, above which the ductility became lower. The poor ductility of diffusion bonded specimen could have caused by the incomplete grain boundary migration and precipitates along the bond-line. Application of post-bond heat treatment (PBHT) improved the ductility close to that of base metals up to $550^{\circ}C$. Changes in tensile properties were discussed in view of the microstructure in the diffusion-bonded area.


Diffusion Bonding;Post-bond Heat Treatment;Austenitic Alloys;Tensile Ductility


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Supported by : 미래창조과학부