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    • 92. 发明授权
    • Blind fastener and production method thereof
    • 盲链及其制造方法
    • US08579566B2
    • 2013-11-12
    • US13158977
    • 2011-06-13
    • Takanori Makino
    • Takanori Makino
    • F16B13/06
    • C21D1/20C23C8/22F16B19/1036F16B37/067
    • This invention relates to a blind fastener having a hollow sleeve with high surface hardness and sufficient elongation, and to a novel heat treatment method therefor. The method for the heat treatment of the blind fastener includes austempering. The austempering includes a step in which a hollow sleeve of cold-rolled low carbon steel with a carbon percentage of 0.08 to 0.13% is heated and maintained from 800° C. to 950° C. during carburization, and a subsequent step in which isothermal maintenance is performed from 320° C. to 500° C. The resulting carbon percentage (CP) value is from 0.3 to 0.5%. Even in the case of a low carbon steel blind fastener, the austempering can harden the surface of the sleeve and soften the inner portion other than the surface for suitable elongation in order to provide a blind fastener having a sleeve with high surface hardness and sufficient elongation.
    • 本发明涉及一种具有高表面硬度和足够伸长率的中空套筒的盲紧固件及其新型热处理方法。 盲链式紧固件的热处理方法包括奥氏体回火。 奥氏体回火装置包括在渗碳过程中将碳含量为0.08〜0.13%的冷轧低碳钢中空套筒加热保持在800℃至950℃的步骤,其后进行等温 维持从320℃到500℃。所得到的碳百分比(CP)值为0.3-0.5%。 即使在低碳钢盲链紧固件的情况下,奥氏体回火可以使套筒的表面变硬并软化表面以外的内部以适当的伸长率,以便提供具有高表面硬度和足够伸长率的套筒的盲紧固件 。
    • 97. 发明申请
    • Ultratough high-strength weldable plate steel
    • 超高强度可焊接板钢
    • US20120125492A1
    • 2012-05-24
    • US13134965
    • 2011-06-22
    • Arup SahaGregory B. Olson
    • Arup SahaGregory B. Olson
    • C21D8/00C22C38/44C22C38/46C22C38/42
    • C22C38/42C21D1/20C21D1/25C21D1/78C21D6/004C21D6/02C21D8/0263C21D2211/001C21D2211/002C21D2211/004C21D2211/008C22C38/44C22C38/46
    • A transformation toughened, high-strength steel alloy useful in plate steel applications achieves extreme fracture toughness (Cv & gt; 80 ft-lbs corresponding to KId=200 ksi.in ½) at strength levels of 150-180 ksi yield strength, is weldable and formable. The alloy is characterized by dispersed austenite stabilization for transformation toughening to a weldable, bainitic plate steel and is strengthened by precipitation of M2C carbides in combination with copper and nickel. The desired microstructure is a matrix containing a bainite-martensite mix, BCC copper and M2C carbide particles for strengthening with a fine dispersion of optimum stability austenite for transformation toughening. The bainite-martensite mix is formed by air-cooling from solution treatment temperature and subsequent aging at secondary hardening temperatures to precipitate the toughening and strengthening dispersions.
    • 可用于板钢应用的转变钢化高强度钢合金在150-180 ksi屈服强度的强度水平下实现极限断裂韧性(Cv> 80ft-lbs,相当于KId = 200ksi.in 1/2),可焊接 和可成形。 该合金的特征在于分散的奥氏体稳定化,用于对可焊接的贝氏体钢板进行变形增韧,并通过与铜和镍的组合沉淀M2C碳化物来加强。 所需的显微组织是含有贝氏体 - 马氏体混合物,BCC铜和M2C碳化物颗粒的基体,用于通过用于转化增韧的最佳稳定性奥氏体的细分散体进行强化。 贝氏体 - 马氏体混合物通过从固溶处理温度空气冷却并随后在二次硬化温度下老化而形成,以沉淀增韧和增强分散体。