公开(公告)号：US5393488A

公开(公告)日：1995-02-28

申请号：US102923

申请日：1993-08-06

申请人： Mark A. Rhoads ,  Edward L. Raymond ,  Warren M. Garrison, Jr.

发明人： Mark A. Rhoads ,  Edward L. Raymond ,  Warren M. Garrison, Jr.

IPC分类号： C22C38/52

CPC分类号： C22C38/52

摘要： A duplex strengthened structural steel that is particularly suitable for demanding applications which require both high yield strength and fatigue properties is provided. The preferred steel alloys of this invention are characterized by both the presence of intermetallic strengthening precipitates like maraging steels, as well as alloy carbide strengtheners as is common with secondary hardening steels. Titanium is substantially absent from the preferred steel alloys of this invention. Thus the formation of nonmetallic inclusions, such as titanium carbonitrides, are alleviated which correspondingly enhances the fatigue properties of the preferred alloys. To compensate for the lack of titanium strengthening precipitates within the alloy, additions of aluminum are provided such that the aluminum forms intermetallic strengthening precipitates with nickel.

摘要翻译： 提供了特别适用于需要高屈服强度和疲劳性能的要求应用的双相加强结构钢。 本发明优选的钢合金的特征在于金属间强化沉淀如马氏体时效钢的存在，以及与二次硬化钢常见的合金碳化物加强剂。 本发明优选的钢合金中基本上不存在钛。 因此，减少了诸如碳氮化钛之类的非金属夹杂物的形成，这相应地提高了优选合金的疲劳性能。 为了补偿合金中缺少钛强化析出物，提供了铝的添加，使得铝与镍形成金属间强化沉淀。

公开(公告)号：US5518820A

公开(公告)日：1996-05-21

申请号：US899562

申请日：1992-06-16

申请人： Benjamin L. Averbach, deceased ,  Jon C. Schaeffer ,  Mark A. Rhoads ,  Joseph A. Heaney, III

发明人： Benjamin L. Averbach, deceased ,  Jon C. Schaeffer ,  Mark A. Rhoads ,  Joseph A. Heaney, III

IPC分类号： F16C33/30 ,  F16C33/62 ,  B32B15/04 ,  F16C33/00

CPC分类号： F16C33/62 ,  F16C33/30 ,  F16C19/06 ,  Y10S384/912 ,  Y10T428/31678

摘要： A bearing includes a bearing component, such as a bearing race, having a bearing contact surface. A region at the bearing contact surface is made of titanium aluminide, preferably an alpha-2 or gamma titanium aluminide. A case-hardened layer present at the surface of the titanium aluminide region increases the hardness and wear resistance of the titanium aluminide at elevated temperature. The case-hardened layer is preferably formed by diffusing carbon into the surface of the titanium aluminide from a gaseous medium, at elevated temperature land at ambient or reduced pressure.

摘要翻译： 轴承包括具有轴承接触表面的轴承部件，例如轴承座圈。 轴承接触表面的区域由铝化铝，优选α-2或γ钛铝化物制成。 存在于铝化钛区域表面的表面硬化层增加了钛酸铝在高温下的硬度和耐磨性。 表面硬化层优选通过在环境温度或减压下在高温焊盘中从气态介质将碳扩散到钛铝化物的表面中而形成。

公开(公告)号：US5100483A

公开(公告)日：1992-03-31

申请号：US690208

申请日：1991-04-24

申请人： Mark A. Rhoads

发明人： Mark A. Rhoads

IPC分类号： C21D1/78 ,  C23C8/80

CPC分类号： C21D1/78 ,  C23C8/80 ,  C21D2261/00

摘要： A method of case hardening ferrometallic parts that avoids the use of protective coatings or shields is provided. The process comprises the steps of a) carburizing the entire part, b) machining the carburized part to form first and second surface regions wherein the second surface region has a carbon content at least 100% greater than the carbon content of the first surface region, c) heating the machined part at a hardening temperature with the entire part in contact with a gaseous atmosphere containing a source of carbon and a carbon content of from 85% to 115% of the carbon content of said first surface region, and d) quenching the part.

摘要翻译： 提供了一种防止使用保护性涂层或屏蔽的硬质化的金属零件的方法。 该方法包括以下步骤：a）渗碳整个部分，b）加工渗碳部分以形成第一和第二表面区域，其中第二表面区域的碳含量比第一表面区域的碳含量大至少100％ c）在硬化温度下加热加工部分，整个部分与含有碳源和碳含量为所述第一表面区域的碳含量的85％至115％的气态气氛接触，以及d）淬火 那个部分。