公开(公告)号：US20110132138A1

公开(公告)日：2011-06-09

申请号：US12958855

申请日：2010-12-02

申请人： Isamu SAITO ,  Yoshihiro TAKITANI ,  Shinichiro KATO ,  Makoto HOBO ,  Keiichiro KAMIYA ,  Takahiro MIYAZAKI ,  Takashi KANO

发明人： Isamu SAITO ,  Yoshihiro TAKITANI ,  Shinichiro KATO ,  Makoto HOBO ,  Keiichiro KAMIYA ,  Takahiro MIYAZAKI ,  Takashi KANO

IPC分类号： F16C3/06

CPC分类号： F16C3/06 ,  B21K1/08 ,  C23C8/32 ,  Y10T29/49286 ,  Y10T74/2173

摘要： A nitrocarburized crankshaft member made of a steel that includes C in an amount by weight of 0.25 to 0.32% as a required element and an optional element that may be included, and Fe and inevitable impurities in a remaining portion. The steel-made crankshaft member mainly includes ferrite and perlite, wherein at least a portion of the steel surface thereof having a ferrite surface area of 50% or greater is imparted with a nitrocarburized hard layer. The nitrocarburized hard layer includes a surface compound layer suppressed to a thickness of 10 to 35 μm, and a nitrogen diffusion zone below the surface compound layer having a diffusion depth of 700 μm or greater. The steel includes C, Si, Mn, Cu, Ni, and Cr as the required elements and Mo, N, s-Al, and Ti as the optional elements.

摘要翻译： 由钢制成的氮碳共渗曲轴构件，其包含作为所需元素的重量为0.25〜0.32％的C和可以包含的任选元素，剩余部分中的Fe和不可避免的杂质。 钢制曲轴构件主要包括铁素体和珍珠岩，其中具有铁素体表面积为50％以上的钢表面的至少一部分被赋予了氮碳共渗硬化层。 氮碳共渗硬化层包括被抑制为10〜35μm厚度的表面化合物层和扩散深度为700μm以上的表面化合物层下方的氮扩散区。 钢包含C，Si，Mn，Cu，Ni和Cr作为所需元素，Mo，N，s-Al和Ti作为任选元素。