公开(公告)号：EP0893192A1

公开(公告)日：1999-01-27

申请号：EP98630038.2

申请日：1998-07-24

Applicant: THE TIMKEN COMPANY

Inventor： Hetzner, Dennis W.

IPC: B23K26/00 ,  B23K26/14 ,  C21D9/40 ,  C21D1/09

CPC classification number: F16C33/64 ,  B23K26/0081 ,  B23K35/004 ,  B23K35/0244 ,  B23K35/0255 ,  B23K2201/00 ,  B23K2203/04 ,  C21D1/09 ,  C21D9/40 ,  C21D2211/008 ,  C21D2251/02 ,  C21D2251/04 ,  F16C19/364

Abstract: A steel machine component, such as a bearing race, has a critical surface of generally circular configuration. Here the steel of the machine component exists in a state of compression to improve the physical characteristics of the surface. To this end, high speed steel is melted along the full circumference of the surface. Upon cooling to room temperature some of the austenite in the steel transforms into martensite. Tempering converts much of the remaining austenite into martensite, so that the machine component at the surface is almost entirely martensite. Martensite normally occupies a greater volume than austenite, but since the layer of martensite so formed is confined by the underlying core of the machine component, the layer exists in a state of compression. The high speed steel is melted with a laser beam that makes a trace over the full surface of the machine component. Where the underlying core is formed from high speed steel, the steel that is melted derives from the core itself, thus producing a glaze over the core. Where the underlying core is another type of steel, the high speed steel which is melted is supplied from an external source as a filler metal and becomes a cladding that lies over, yet is bonded to, the core.

公开(公告)号：EP0758023A1

公开(公告)日：1997-02-12

申请号：EP96630041.0

申请日：1996-07-31

Applicant: THE TIMKEN COMPANY

Inventor： Hetzner, Dennis W.

IPC: C21D9/40 ,  C21D1/09

CPC classification number: F16C33/64 ,  C21D1/09 ,  C21D9/40 ,  C21D2201/03 ,  C21D2211/001 ,  C21D2211/003 ,  C21D2211/008 ,  F16C19/364 ,  F16C33/585 ,  Y10S148/903 ,  Y10S384/912

Abstract: A machine component which is formed from a high alloy steel has, along a surface where the component is subjected to cyclic loading, a glaze in which the steel has a refined microstructure that resists spalling. Whereas the microstructure of the core underlying the glaze contains carbides of relatively large particle size, the microstructure of the glaze contains carbides of a much smaller particle size. For the most part the microstructure of the glaze comprises martensite and retained austenite in a fine dendritic network. The glaze is acquired by directing a laser beam at the surface, with the beam having sufficient energy and intensity to melt the component where it illuminates the surface, thus creating a puddle. Relative motion between the beam and the component advances the puddle over the surface. The molten metal in the previously illuminated region loses its heat to the underlying core of the component and solidifies, in effect undergoing a self-quench. The solidification is rapid enough to prevent the formerly dissolved carbides from consolidating into large particles and to prevent the martensite and retained austenite from growing into large grains.

Abstract translation: 由高合金钢形成的机器部件沿着部件经受循环负荷的表面，具有钢具有抗剥落的精细微细结构的釉料。 而釉料下面的芯的微结构包含比较大的粒径的碳化物，釉料的微结构含有比较小粒度的碳化物。 在大多数情况下，釉料的微观结构包括细小的树枝状网络中的马氏体和残余奥氏体。 通过在表面处引导激光束获得釉料，其中光束具有足够的能量和强度以熔化部件，在该部分照射表面，从而产生熔池。 梁和组件之间的相对运动使水坑在表面上前进。 先前照射区域中的熔融金属将其热量损失到组分的下面的核心并且固化，实际上经历自熄灭。 凝固速度足够快以防止原溶解的碳化物固结成大颗粒，并防止马氏体和残余奥氏体生长成大颗粒。

公开(公告)号：EP0893192B1

公开(公告)日：2002-10-23

申请号：EP98630038.2

申请日：1998-07-24

Applicant: THE TIMKEN COMPANY

Inventor： Hetzner, Dennis W.

IPC: B23K26/00 ,  B23K26/14 ,  C21D9/40 ,  C21D1/09

CPC classification number: F16C33/64 ,  B23K26/0081 ,  B23K35/004 ,  B23K35/0244 ,  B23K35/0255 ,  B23K2201/00 ,  B23K2203/04 ,  C21D1/09 ,  C21D9/40 ,  C21D2211/008 ,  C21D2251/02 ,  C21D2251/04 ,  F16C19/364