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    High strength hard alloy and method of preparing the same
    31.
    发明申请
    High strength hard alloy and method of preparing the same 失效
    高强度硬质合金及其制备方法

    公开(公告)号：US20070110607A1

    公开(公告)日：2007-05-17

    申请号：US11518519

    申请日：2006-09-11

    Applicant: Masahiro Iwasaki ,  Hidefumi Yanagita ,  Masaaki Ikebe

    Inventor： Masahiro Iwasaki ,  Hidefumi Yanagita ,  Masaaki Ikebe

    IPC: C22C1/05

    CPC classification number: C22C1/051 ,  B22F2003/242 ,  B22F2998/10 ,  B22F2999/00 ,  C22C29/067 ,  C22C29/08 ,  B22F3/02 ,  B22F3/10 ,  B22F1/0088 ,  B22F3/1035 ,  B22F3/24 ,  B22F2201/30 ,  B22F2201/02 ,  B22F2201/016

    Abstract: The present invention provides a WC—Co system (the WC—Co system in the present invention means that it comprises not only hard grains composed mainly of WC and iron group metal powder containing Co, but also at least one kind selected from carbide, nitride, carbonitride and boride of elements in Groups IVa, Va and VIa of the Periodic Table, excluding WC, as hard grains) cemented carbide having high strength and high toughness which is excellent in wear resistance, toughness, chipping resistance and thermal crack resistance. A WC—Co system compact containing an M12C to M3C type double carbide (M represents one or more kinds selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, and one or more kinds selected from the group consisting of Fe, Co and Ni) as a main component of the surface layer portion is subjected to a carburization treatment, and then subjected to liquid phase sintering so as to adjust the mean grain size of the surface layer WC depending on a liquid crystal sintering temperature as an indicator.

    Abstract translation: 本发明提供一种WC-Co体系（本发明中的WC-Co系不仅包含由WC组成的硬质粒子和含有Co的铁族金属粉末，而且还包含选自碳化物，氮化物 ，元素周期表第Ⅳa，Ⅴa和Ⅵa族元素的碳氮化物和硼化物，不含WC，作为硬晶粒）具有优异的耐磨性，耐韧性，耐崩裂性和耐热裂纹性的高强度和高韧性的硬质合金。 含有M 12 C至M 3 C型双碳化物的WC-Co系压实体（M表示选自Ti，Zr，Hf中的一种或多种 ，V，Nb，Ta，Cr，Mo和W以及选自Fe，Co和Ni中的一种或多种）作为表层部分的主要成分进行渗碳处理，然后进行 液相烧结，以根据液晶烧结温度作为指标调整表面层WC的平均粒径。

    Powder metallurgy manufactured high speed steel
    32.
    发明授权
    Powder metallurgy manufactured high speed steel 有权
    粉末冶金制造高速钢

    公开(公告)号：US06818040B1

    公开(公告)日：2004-11-16

    申请号：US09979025

    申请日：2001-11-15

    Applicant: Odd Sandberg ,  Leif Westin

    Inventor： Odd Sandberg ,  Leif Westin

    IPC: B22F300

    CPC classification number: C22C33/0278 ,  B22F2998/10 ,  B22F2999/00 ,  C21D1/18 ,  C21D6/00 ,  C21D2211/004 ,  C22C33/0292 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/36 ,  B22F9/082 ,  B22F1/0088 ,  C22C33/0207 ,  B22F3/15 ,  B22F3/16 ,  B22F2201/016

    Abstract: A powder metallurgy manufactured high speed steel with a high content of nitrogen in the form of a body formed through consolidation of alloyed metal power has the chemical composition in weight-% ; 1-25 C, 1-3.5 N, 0.05-1.7 Mn, 0.05-1.2 Si, 3-6 Cr, 2-5 Mo, 0.05-5W, 6.2-1.7 (V+2 Nb), balance iron and unavoidable impurities in normal amounts, wherein the amount of, on one hand, the carbon equivalent, Ceq, expressed as formula (I), and, on the other hand, the vanadium equivalent, Veq, expressed as Veq=V+2 Nb, are balanced relative to each other such that the amounts of said elements, express in term of said equivalent, will lie within the area A1-B1-C1-D1-A1 in the system of co-ordinates in the figure, in which the Ceq/Veq-co-ordinates of the points A1-D1 are A1: 4.5/17; B1: 5.5/17; C1: 2.5/6.2; D1; 1.5/6.2. The structure of the steel in the hardened and tempered condition, contains 12-40 vol-% of hard matter consisting of particles of MX-type, which are evenly distributed in the matrix of the steel, where M in said hard matter of MX-type essentially consists of vanadium and/or niobium, and X consists of 30-50 weight-% carbon and 50-70 weight-% nitrogen.

    Abstract translation: 粉末冶金制造的高速钢，具有以合金金属强度固结形成的主体形式的氮含量高，化学组成为重量百分比; 1-25℃，1-3.5N，0.05-1.7Mn，0.05-1.2Si，3-6Cr，2-5Mo，0.05-5W，6.2-1.7（V + 2Nb），余量为铁和不可避免的杂质 正常量，其中一方面碳当量Ceq，以式（I）表示，另一方面，钒当量Veq，表示为Veq = V + 2Nb，相对于 使得所述元素的量以所述等价物表示将在图中的坐标系中的区域A1-B1-C1-D1-A1内，其中Ceq / Veq- A1-D1点的坐标为A1：4.5 / 17; B1：5.5 / 17; C1：2.5 / 6.2; D1; 1.5 / 6.2。 钢在硬化和回火状态下的结构含有12-40vol％的由MX型颗粒组成的硬质物质，均匀分布在钢基体中，其中M在所述MX- 类型基本上由钒和/或铌组成，X由30-50重量％的碳和50-70重量％的氮组成。

    Valve seat for internal combustion engines
    33.
    发明申请
    Valve seat for internal combustion engines 有权
    内燃机用阀座

    公开(公告)号：US20010037842A1

    公开(公告)日：2001-11-08

    申请号：US09846824

    申请日：2001-05-01

    Inventor： Koichiro Hayashi ,  Hideaki Kawata ,  Toru Tsuboi

    IPC: C22C038/16 ,  C22C038/20

    CPC classification number: C22C33/0264 ,  B22F2998/00 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/0207 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  F01L3/02 ,  C22C33/0228 ,  B22F3/02 ,  B22F3/10 ,  B22F3/1007 ,  B22F2201/016

    Abstract: A valve seat is provided in which wear resistance can be ensured by optimizing the matrix structure without dispersing of expensive hard particles, and therefore the machinability can be improved and the holding down of cost can be achieved. The valve seat exhibits a metallographic structure consisting of only bainite single phase or only a mixed phase of bainite and martensite, has an area ratio of bainite and martensite in cross section of 100:0 to 50:50, and has a matrix hardness of 250 to 850 Hv.

    Abstract translation: 提供了一种阀座，其中通过优化基体结构而不会分散昂贵的硬质颗粒，可以确保耐磨性，因此可以提高切削性，并且可以实现成本的降低。 阀座呈现由贝氏体单相或贝氏体和马氏体的混合相组成的金相结构，贝氏体和马氏体的面积比为100:0〜50:50，基体硬度为250 到850 Hv。

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