M. Yukumoto et H. Yamane, EFFECT OF SECONDARY COOLING ON MICROSTRUC TURES IN A RAPIDLY SOLIDIFIED HIGH CR STAINLESS-STEEL STRIP, Tetsu to hagane, 82(11), 1996, pp. 911-916
The rapid solidification process, which omits the hot rolling stage, w
as employed for the production of a thin strip made of materials which
typically have poor workability. The process required the solidified
strip to be cooled carefully so that embrittlement or recrystalization
did not occur: 30Cr-14Ni stainless steel, solidified to a thin strip
by a twin roll easter, was subjected to another cooling (secondary coo
ling) before coiling. The transition of strip temperatures during the
cooling was estimated both by measurement and by calculation. From the
experimentally observed relationship between the heat treatment and e
mbrittlement. the optimum condition for the secondary cooling was obta
ined. Experiments showed that the strip became embrittled when it was
subjected to 930 K for 5 min. Therefore the cast strip was passed thro
ugh the secondary cooling zone of water jets. The coiling temperature
was kept below 700 K and no embrittlement was observed. As a result, a
strip was delivered as an overlay welding material on a semi-commerci
al basis.