公开(公告)号：US5248354A

公开(公告)日：1993-09-28

申请号：US946857

申请日：1992-09-18

Applicant: Shuji Tada ,  Toshio Takahashi ,  Toshihiko Abe

Inventor： Shuji Tada ,  Toshio Takahashi ,  Toshihiko Abe

IPC: C21D1/20 ,  C21D1/46 ,  C21D5/00 ,  C22C37/04

CPC classification number: C21D5/00 ,  C21D1/20 ,  C21D1/46 ,  C21D2221/00 ,  C21D2281/02

Abstract: A unique method is proposed for the preparation of a body of an austempered ductile cast iron having a gradient of the mechanical property within the body by subjecting a body of a nodular graphite cast iron to an isothermal transformation treatment for austempering at a temperature in the range from 250.degree. to 450.degree. C. while the body has a temperature difference between two points or between two surfaces. The temperature difference can be produced by bringing the two points or two surfaces into contact with melts of a salt kept at different temperatures. A two-compartment salt-bath apparatus therefore is disclosed.

Abstract translation: 提出了一种独特的方法，用于制备具有机体性质梯度的奥氏体铸造球体，该体系通过使球墨铸铁体在等温转变处理中进行等温转化处理 在250℃至450℃之间，而本体在两点之间或两个表面之间具有温差。 可以通过使两点或两个表面与保持在不同温度的盐的熔体接触来产生温差。 因此，公开了一种双室盐浴装置。