Welded nickel alloy double-cantilever beam crack growth sensor and
method for its fabrication
    13.
    发明授权
    Welded nickel alloy double-cantilever beam crack growth sensor and method for its fabrication 失效
    焊接镍合金双悬臂梁裂纹扩展传感器及其制造方法

    公开(公告)号:US5349869A

    公开(公告)日:1994-09-27

    申请号:US43052

    申请日:1993-04-05

    摘要: A double-cantilever beam crack growth sensor made from welded alloy, e.g., nickel-based alloy, and a method for fabricating such sensors. The method includes the steps of forming a strongback from a block of a first nickel-based alloy; depositing a suitable thickness of nickel-based weld alloy on top of the strongback to form a bi-metallic test block; welding a second block of the first nickel-based alloy on top of the weld alloy; and machining the final three-layer block to form a double-cantilever beam crack growth sensor consisting of cantilever beams made of the first nickel-based alloy, a crack growth section of weld alloy having a microstructure wherein the direction of dendritic growth is parallel to the direction of crack growth and a third section made of the first nickel-based alloy.

    摘要翻译: 由焊接合金例如镍基合金制成的双悬臂梁裂纹扩展传感器,以及制造这种传感器的方法。 该方法包括从第一镍基合金的块形成强反射的步骤; 在强背上沉积适当厚度的镍基焊接合金以形成双金属试块; 在焊接合金的顶部焊接第一镍基合金的第二块; 并加工最终的三层块以形成由第一镍基合金制成的悬臂梁组成的双悬臂梁裂纹扩展传感器,具有微结构的焊接合金的裂纹扩展部分,其中树枝状生长方向平行于 裂纹生长的方向和由第一镍基合金制成的第三部分。

    Method for localization of tensile residual stress and product produced
thereby
    14.
    发明授权
    Method for localization of tensile residual stress and product produced thereby 失效
    拉伸残余应力定位的方法及由此产生的产品

    公开(公告)号:US5013370A

    公开(公告)日:1991-05-07

    申请号:US548437

    申请日:1990-07-02

    申请人: Thomas P. Diaz

    发明人: Thomas P. Diaz

    IPC分类号: C21D1/00 C21D9/08

    CPC分类号: C21D1/00 C21D9/08 Y10S148/902

    摘要: A metallic object is treated to produce tensile residual stress in a known localized area of the metallic object. A metallic object having at least one portion substantially free of tensile residual stress is provided, and a localized area adjacent to or a part of the tensile stress-free area is selected. The localized area is subjected to heating on one surface and cooling on the opposite surface. Upon cooling to ambient temperature, the known localized area has tensile residual stress. The localized area can have cracks formed therein by crack-promotion techniques, such as submersion in boiling magnesium chloride. The area can be tested by attaching electrodes and subjecting the area to a reversing direct current crack growth measurement procedure.

    摘要翻译: 处理金属物体以在金属物体的已知局部区域中产生拉伸残余应力。 提供具有至少一个部分基本上没有拉伸残余应力的金属物体,并且选择与抗拉应力区域相邻或部分的局部区域。 局部区域在一个表面上进行加热并在相对的表面上冷却。 当冷却到环境温度时,已知的局部区域具有拉伸残余应力。 通过裂解促进技术,例如浸入沸腾的氯化镁中,局部区域可以形成裂缝。 可以通过连接电极并对该区域进行逆向直流裂纹扩展测量程序来测试该区域。