• Title/Summary/Keyword: alloy 690

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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
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.12
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    • pp.1221-1227
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    • 2015

  • 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.

  • https://doi.org/10.3795/KSME-A.2015.39.12.1221 인용 PDF KSCI

Study of a PbSCC of Alloy 690 Tube at a High Temperature using an Electrochemical Noise Technique (전기화학 노이즈 기술을 이용한 고온에서의 Alloy 690 튜브의 PbSCC에 관한 연구)

  • Lee, Sang-Hun;Kim, Seong-U;Kim, Hong-Pyo
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2011.05a
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    • pp.121-122
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    • 2011

  • 원자력 발전소 등 산업체 설비의 부식을 모니터링하고 부식 생성여부와 지속적인 사용 가능성을 판단하며, 그 상황에서의 적절한 조치을 취하게 할 수 있는 전기화학적 노이즈 측정은 정밀제어기술의 발전과 함께 그 응용 가능성이 커짐에 따라 관심이 증대되고 있기에 이를 본 연구에 적용 하고자 한다.

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Fracture properties and crack tip constraint quantification of 321/690 dissimilar metal girth welded joints by using miniature SENB specimens

  • Bao, Chen;Sun, Yongduo;Wu, Yuanjun;Wang, Kaiqing;Wang, Li;He, Guangwei
    • Nuclear Engineering and Technology
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    • v.53 no.6
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    • pp.1924-1930
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    • 2021

  • By using miniature SENB specimens, the fracture properties of the materials in the region of welded metal, 321 stainless steel heat affected zone, 690 alloy heat affected zone of 321/690 dissimilar metal girth welded joints were tested. Both the J-resistance curves and critical fracture toughness of the three different materials are affected by the crack size because of the effect of crack tip constraint. Groups of constraint corrected J-resistance curves of the three materials are obtained according to J-Q-M approach. The welded metals exhibit the best fracture resistance but the worst fracture resistance is observed in the material of 690 alloy heat affected zone.

  • https://doi.org/10.1016/j.net.2020.12.020 인용 PDF KSCI