Chia Nan University of Pharmacy & Science Institutional Repository:Item 310902800/30986
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    Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/30986


    Title: A study of high-strength bolts after dephosphoring
    Authors: Hsia, Shao-Yi
    Chou, Yu-Tuan
    Chao, Jung-Chi (Robin)
    Contributors: Kao Yuan Univ, Dept Mech & Automat Engn
    Chia Nan Univ Pharm & Sci, Dept Appl Geoinformat
    Optimas OE Solut
    Keywords: Dephosphoring
    fastener
    delta ferrite
    high-tensile bolt
    delayed fracture
    Date: 2016-03
    Issue Date: 2018-01-18 11:39:15 (UTC+8)
    Publisher: Sage Publications Ltd
    Abstract: A wide variety of fasteners are produced, including those for the automobile industry, household electrical appliances industry, architectural engineering, and even the aviation industry. The effects of the high-tensile bolt dephosphoring process on the entire fastener manufacturing process and its organizational characteristics and mechanical properties are analyzed and discussed in this study. Our experimental results reveal that the bolt dephosphoring process must be completed before heat treatment, which can be confirmed with a dephosphoring reagent or metallographic observation. Once bolt heat treatment is completed, bolts without dephosphoring appear to be coated with delta ferrite (delta ferrite) composed of a phosphate coating and a phosphatizing coating, which are not easily removed. Heat treatment with phosphorus results in grain boundary segregation, causing embrittlement and a reduction in lattice bonding forces and resulting in a high risk of fracturing when bolts are used in high-temperature environments or undergo multiaxial stresses.
    Relation: Advances In Mechanical Engineering, v.8 n.3
    Appears in Collections:[Dept. of Applied Geoinformatics] Periodical Articles

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