Year: 1978
Type: article
Abstract: In order to redllce the occurrellce oj suiftlCe difects oj a cOlltillUOUS castillg slab, the most suitable secolldary coolillg pattern was de filled all the basis oj the results oj a theoretical calCillalioll allri a laboratory scale ex-Ilerimellt all the thermal hysteresis similar to those oj cOlltilluous castillg slabs.M oreover, i t has been considered ill this study that the trallsverse corner cracks could be relaled to the p resellce oj precipitates appeared ill the austenite grain boundaries.(1) T rallsverse corner cracks are formed by the precipitates oj AI N ap/leared all the grain boundary in the austenite region at the temperatures in the rallge oj 700 0 to 950°C.Especially, the AIN Jormatioll is accelerated by reheatillg it at th e temperature above 700 0 e Jrom Ihp.lower temperature.(2) From tlIP experimelltal results all the roles oj secondary coolillg pattern and oj temperature nt th e unbending roll in slnbs continuously cnst, it is nscertained that the occurrence oj transverse corner crack is SllC-cessflll~l' prevellted ~y the secolldary cooling pattern , that is, a suitable coolillg rate is less thall 83 e lm ill the upper part oj continuolls casting machille.(3) T he lI<w~)'-dev leoped slnay coolillg I,nttern is also eflective Jar th e redllctioll oj 10llgitudillal slIr/ace cracks.
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2997744463