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    • 36. 发明申请
    • Rolling elements
    • 滚动元素
    • US20050247377A1
    • 2005-11-10
    • US11154919
    • 2005-06-16
    • Takemori TakayamaNaoji HamasakaNoriko Morioka
    • Takemori TakayamaNaoji HamasakaNoriko Morioka
    • C21D6/00C21D9/32C22C38/00C22C38/54C22C38/58C23C8/22C23C8/80
    • C23C8/80C23C8/22
    • The pitting resistance of a gear is increased by hardening its tooth flanks through application of carburizing/quenching, bright hardening and induction hardening to a steel material capable of providing significantly improved softening resistance in tempering at a low temperature of 300 to 350° C. To this end, the steel material prepared so as to satisfy the relationship described by: 5≦4.3×Si (wt %)+7.3×Al (wt %)+3.1×V (wt %)+1.5×Mo (wt %)+1.2×Cr (wt %)×(0.45÷C (wt %)) is carburized such that the carbon concentration of its carburized surface layer is adjusted to 0.6 to 0.9 wt %; and the steel material is subjected to quenching and tempering at 300° C. or less subsequently to the carburization process, or alternatively the steel material is once cooled after the carburization process and then subjected to treatments of re-heating hardening and tempering at 300° C. or less so that a hardness of HRC 58 or more is ensured by the tempering process at 300° C.
    • 通过在300〜350℃的低温下能够提供显着提高的回火的耐软化性的钢材,通过对渗碳/淬火,光亮硬化和感应淬火进行渗碳淬火来淬火其齿面来增加齿轮的耐点蚀性。 为了满足以下关系而制备的钢材:5 <= 4.3×Si(wt%)+ 7.3×Al(wt%)+ 3.1×V(wt%)+ 1.5×Mo(wt%)+ 1.2×Cr wt%)×(0.45 / C(重量%))渗碳,使其渗碳表面层的碳浓度调整为0.6〜0.9重量% 钢材在渗碳处理后在300℃以下进行淬火回火,或者在渗碳处理后钢材一次冷却后,在300℃下进行再加热硬化回火处理 C以下,通过300℃的回火处理确保HRC58以上的硬度。
    • 38. 发明授权
    • High surface pressure resistant steel parts and methods of producing same
    • 高表面耐压钢零件及其制造方法
    • US06413328B2
    • 2002-07-02
    • US09319999
    • 1999-06-16
    • Takemori TakayamaNaoji Hamasaka
    • Takemori TakayamaNaoji Hamasaka
    • C23C832
    • F16C33/30C23C8/28C23C8/32C23C8/34C23C8/80F16C2204/62
    • High surface pressure resistant steel parts and their producing methods are disclosed. These steel parts are useful as gears, cams, bearings and similar high-strength compact steel articles which are required to have wear resistance and strength to withstand fatigue in rolling or rolling-slipping applications. In a steel part formed according to the invention, a fine nitride and/or carbonitride having at least an average grain size of 0.3 &mgr;m or less is dispersed in the contact surface structure; a multi phase structure composed of martensite, which is divided into extremely fine pieces, forming a disordered shape, by the nitride and/or carbonitride, is formed; and a carbide having a grain size of 3 &mgr;m or less is dispersed to increase the hardness of the surface. Such a steel part is produced by carrying out carbonitriding or carburization/carbonitriding so as to precipitate extremely fine AIN, using nitrogen permeating from the surface and by carrying out quenching or quenching/tempering, starting from a temperature region where the parent phase is austenite
    • 公开了高表面耐压钢部件及其制造方法。 这些钢部件可用作齿轮,凸轮,轴承和类似的高强度紧凑型钢制品,其需要具有耐磨性和强度以承受轧制或滚压应用中的疲劳。 在根据本发明形成的钢部件中,至少平均粒径为0.3μm或更小的细氮化物和/或碳氮化物分散在接触表面结构中; 形成由马氏体组成的多相结构,其通过氮化物和/或碳氮化物分割成极细的块,形成无序的形状; 并且分散具有3μm以下的粒径的碳化物以增加表面的硬度。 这样的钢部件是通过进行碳氮共渗或渗碳/碳氮共渗来制造的,以便从表面渗氮并通过进行淬火或淬火/回火,从母相为奥氏体的温度区域开始沉淀出极细的AIN