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    • 1. 发明申请
    • TITANIUM ALLOY BAR SUITABLE FOR PRODUCING ENGINE VALVE
    • 钛合金棒适用于生产发动机阀门
    • WO1994002656A1
    • 1994-02-03
    • PCT/JP1993000874
    • 1993-06-28
    • NIPPON STEEL CORPORATIONTAKAYAMA, IsamuYAMAMOTO, SatoshiKIZAKI, Masanori
    • NIPPON STEEL CORPORATION
    • C22C14/00
    • C22F1/183C22F1/186F01L3/02
    • A titanium alloy bar which is excellent in the dimensional and configurational precision in manufacturing an engine valve and in the wearproofing treatment comprising the oxidation or nitridation of the surface, thus being suitable for mass producing engine valves. The bar is one made from an (alpha)+(beta)-type titanium alloy and having a microtexture selected from among an acicular (alpha)-crystal texture wherein the (alpha)-crystal has the width of 1 (my)m or above, another acicular (alpha)-crystal texture wherein the (alpha)-crystal has the width of 1 (my)m or above and isometric (alpha)-crystals are dispersed, and an isometric (alpha)-crystal texture wherein the (alpha)-crystal grain has the diameter of 6 (my)m or above. This bar can be produced most efficiently by limiting the diameter of the (beta)-crystal grain in the acicular (alpha)-crystal texture in the microtexture of the bar to 300 (my)m or less and the width of the acicular (alpha)-crystal to be in the range of 1 (my)m to 4 (my)m.
    • 一种在制造发动机气门的尺寸和结构精度方面优异的钛合金棒,以及包括表面的氧化或氮化的耐磨处理,因此适用于批量生产发动机阀。 该棒是由(α)+(β)型钛合金制成的,并且具有选自针状(α) - 晶体结构的微纹理,其中(α) - 晶体的宽度为1(m) 上述另外一种针状(α)晶体结构,其中(α)晶体的宽度为1(my)m或更高,等轴(α) - 晶体分散,等轴(α) - 晶体结构,其中( α)晶粒的直径为6(my)m以上。 通过将棒的微纹理中的针状(α) - 晶体织构中的(β)晶体晶粒的直径限制为300(my)m或更小,针状(α) ) - 晶体在1(我)m到4(my)m的范围内。