Rolling element and method of producing the same
    81.
    发明申请
    Rolling element and method of producing the same 失效
    滚动元件及其制造方法

    公开(公告)号:US20040256029A1

    公开(公告)日:2004-12-23

    申请号:US10790931

    申请日:2004-03-01

    申请人: KOMATSU LTD.

    IPC分类号: C23C008/32 C23C008/22

    摘要: There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300null C. To this end, the rolling element is made from a steel material containing at least 0.45 to 1.5 wt % C and one or more alloy elements selected from 0.1 to 0.5 wt % V and 0.3 to 1.5 wt % Cr, and has a rolling contact surface layer having a structure tempered at low temperature in which 2 to 18% by volume cementite disperses in a martensite parent phase formed by induction heating and cooling and containing 0.25 to 0.8 wt % carbon solid-dissolving therein.

    摘要翻译: 提供了一种在诸如感应淬火齿轮的高界面压力下使用的便宜的滚动元件,该滚动元件在其齿面的抗咬合性方面得到提高,并且在300℃下具有HRC 50以上的回火硬度。为此, 滚动元件由含有至少0.45至1.5重量%的C和一种或多种选自0.1至0.5重量%V和0.3至1.5重量%Cr的合金元素的钢材制成,并具有具有结构的滚动接触表面层 在低温下回火,其中2〜18体积%的渗碳体分散在通过感应加热和冷却形成的马氏体母相中,并含有固溶于其中的0.25至0.8重量%的碳。

    Wire-shaped product, method for its manufacturing, and wear part made of the product
    82.
    发明授权
    Wire-shaped product, method for its manufacturing, and wear part made of the product 失效
    线形产品,其制造方法和由产品制成的磨损部件

    公开(公告)号:US06797031B1

    公开(公告)日:2004-09-28

    申请号:US10110971

    申请日:2002-04-18

    IPC分类号: C22C3822

    摘要: The invention concerns a method for the manufacturing of a wire-shaped product with high wear resistance. The characteristic feature is that a melt is prepared of a martensitic stainless chromium steel which contains in weight-% 0.6-3.0 C, max 2.0 Si max 2.0 Mn, 13-30 Cr, 0-10 Mo, from zero to totally max 10% of those strong carbide forming elements which belong to the group of elements which comprises V, Nb, Ta and Zr, totally max 1% of other, optionally existing alloying elements, balance iron and unavoidable impurities, that the melt is tapped and caused to solidify through cooling at a cooling rate of at least 100° C./s so that a solidified material is obtained which contains evenly distributed carbides, wherein essentially all existing carbide particles has a maximal particle size of 8 &mgr;m, particle size being defined as the mean value of the length and breadth of a particle observable in a light-optical microscope, and that an intermediate product is formed of said material in the form of a wire which is cold drawn and optionally is cold-rolled to desired final dimension, whereafter the wire is hardened and tempered for the achievement of said wire-shaped product which has a microstructure substantially consisting of tempered martensite containing carbides with a particle size of max 8 &mgr;m. The invention also concerns the wire-shaped product and its use for wear parts in combustion engines.

    摘要翻译: 本发明涉及制造具有高耐磨性的线状产品的方法。 特征在于制备了一种马氏体不锈钢,其重量比为0.6-3.0℃,最大2.0Si最大2.0Mn,13-30Cr,0-10Mo,从零到最大10% 属于包含V,Nb,Ta和Zr的元素组的那些强烈的碳化物形成元素,最多为其他任意存在的合金元素的1%,余量为铁和不可避免的杂质,熔融物被敲击并使其凝固 通过以至少100℃/秒的冷却速率冷却,从而获得含有均匀分布的碳化物的固化材料,其中基本上所有现有的碳化物颗粒的最大粒径为8μm,粒度定义为平均值 在光学显微镜中可观察到的颗粒的长度和宽度的值,并且中间产品由所述材料形成为线材形式,其被冷拔并任选地冷轧成所需的最终尺寸,之后 线材被硬化和回火以实现所述线形产品,其具有基本上由具有最大8μm的粒度的回火马氏体含碳化物组成的微结构。 本发明还涉及线形产品及其在内燃机中的磨损部件的用途。

    Method of forming cast alloys having high strength and plasticity
    83.
    发明授权
    Method of forming cast alloys having high strength and plasticity 失效
    形成具有高强度和可塑性的铸造合金的方法

    公开(公告)号:US06764560B1

    公开(公告)日:2004-07-20

    申请号:US09695180

    申请日:2000-10-24

    IPC分类号: C21D118

    摘要: The present invention provides cast high-carbon steel having high strength and plasticity and a method for its formation. In the method, forming during cooling from the melting point through temperature control results in a structure having small size cementite grains supported in a plastic matrix. Alloys other than high-carbon steel, including nickel, titanium, zirconium, and aluminum, can also be produced by the process.

    摘要翻译: 本发明提供具有高强度和可塑性的铸造高碳钢及其形成方法。 在该方法中,通过温度控制从熔点冷却时的形成导致了在塑料基体中负载的小尺寸渗碳体的结构。 也可以通过该方法制造除了高碳钢以外的合金,包括镍,钛,锆和铝。

    Systems and methods for controlling the activity of carbon in heat treating atmospheres
    85.
    发明授权
    Systems and methods for controlling the activity of carbon in heat treating atmospheres 有权
    控制热处理环境中碳活性的系统和方法

    公开(公告)号:US06591215B1

    公开(公告)日:2003-07-08

    申请号:US09252158

    申请日:1999-02-18

    IPC分类号: C21D1100

    摘要: Systems and methods monitor the activity of carbon in a heat treating atmosphere, e.g., where a two phase region is desired for spherodize annealing. The systems and methods generate a computed activity of carbon value for the gas atmosphere as a function of temperature, partial pressure of oxygen, and carbon monoxide content of the gas atmosphere, and without determining a carbon dioxide content of the gas atmosphere. The systems and methods can make use of the computed activity of carbon value, e.g., to control the gas atmosphere.

    摘要翻译: 系统和方法监测热处理气氛中碳的活性,例如需要两相区域用于球化退火。 系统和方法产生气体气氛中碳值的计算活动,作为气体气氛的温度,氧分压和一氧化碳含量的函数,并且不确定气体气氛的二氧化碳含量。 系统和方法可以利用所计算的碳值活性,例如控制气体气氛。

    Rolling bearing
    86.
    发明授权
    Rolling bearing 失效
    滚动轴承

    公开(公告)号:US06547442B1

    公开(公告)日:2003-04-15

    申请号:US09786320

    申请日:2001-03-02

    IPC分类号: F16C3362

    摘要: A structure of at least a stationary-side race of a bearing is transformed into a lower bainite structure through an isothermal transformation treatment. Furthermore, the adjustment is made for hardness to HRC=54 to 64, an amount of residual austenite to not more than 5% and an area percentage of 0.8 &mgr;m or longer carbide to not more than 20% based on the total area of secondary carbide. Thus is prevented the occurrence of a white layer in the rolling bearing.

    摘要翻译: 轴承的至少一个固定侧座圈的结构通过等温转变处理转变成下贝氏体结构。 此外,根据碳化物的总面积,将硬度调整为HRC = 54〜64,残余奥氏体量为5%以下,面积百分比为0.8μm以上,碳化物为20%以下 。 从而防止滚动轴承中出现白色层。

    Cast steel composition for railway components
    87.
    发明申请
    Cast steel composition for railway components 有权
    铁路部件铸钢组成

    公开(公告)号:US20030047247A1

    公开(公告)日:2003-03-13

    申请号:US10157090

    申请日:2002-05-29

    发明人: Bruce A. Milligan

    IPC分类号: C22C038/22

    摘要: A high strength steel alloy for use in manufacturing railway car components. The alloy has a chemical composition that meets the industry required specifications for B grade steel and exhibits better mechanical properties, such as higher yield and tensile strengths. Secondary benefits of the inventive steel alloy include enhanced weldability and improved fatigue resistance.

    摘要翻译: 用于制造铁路车辆部件的高强度钢合金。 该合金具有满足B级钢的工业要求规格的化学成分,并具有更好的机械性能,如较高的屈服强度和抗拉强度。 本发明钢合金的次要优点包括增强的可焊性和改善的耐疲劳性。