Method of hot-forming metals prone to crack during rolling

Details Method of hot-forming metals prone to crack during rolling Method of hot-forming metals prone to crack during rolling

1981-03-09

1984-06-26

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 115A, C22F 104

Patent

active

044564910

ABSTRACT:
A method of continuously casting a molten metal in a casting means to obtain a solidified cast bar at a hot-forming temperature, passing the cast metal at a hot-forming temperature from the casting means to a hot-forming means, and hot forming the cast bar into a wrought product by a two-stage reduction of its cross-sectional area while it is still at a hot-forming temperature, including, in the first stage, the step of forming a substantially uniform subgrain or cell structure in the outer surface layers of the cast bar by a selected small amount of deformation of the cast bar in its as-cast condition prior to the second stage in which substantial reduction of its cross-sectional area forms the wrought product. The substantially uniform subgrain structure formed on the cast bar during the first stage of deformation produces a bar that has increased ductility compared to bar produced by the prior art processes and permits substantial reduction of the cross-sectional area of the cast bar during the second stage of deformation without the cast bar cracking, even when the cast bar has a relatively high percentage of alloying elements present.

REFERENCES:
patent: 3680623 (1972-08-01), Tarmann et al.
patent: 3710841 (1973-01-01), Baumann
patent: 4003236 (1977-01-01), Quehen
patent: 4151896 (1979-05-01), Nicoud et al.
patent: 4177085 (1979-12-01), Chadwick et al.
patent: 4234359 (1980-11-01), Chia et al.
patent: 4352697 (1982-10-01), Adams et al.

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