A guide to the Solidification of Steels by Jernkontoret

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I Figure 2 t.. '- R = Tq = d = y-dend (Note: J 2,O°C/s 1360°C 75 fLm rites. ) .. -' •.. ,. '\ <.. •, \ . 1 A /, • I < Completely solidified ~Jf' I r .. ~ Y I' , , -- , . ,\ " •• 25 , I 'r \ i ,. • .. - , 1& \ ~ )- ~ ) ) " \ x liquid (L). \ . Figure 3 J '. I ,-. I •.. ( , • R = O,5°C/s Tq = 1360°C d =110fLm Figures 3-4: Former o-dendrites, transformed to y by the peritectic reaction. ,.. I \'" . , r x 25 - Figure 4 R Tq d " ", = O,1°C/s = 1360°C =180fLm 400 fLm x 25 Steel 213 • 45 STEEL 213.

I I '\ \. ' ( d 400 , ~ { , \ t \ \ \ ,,. { , • t\ . ~ '- \ J = 0,5°C/s '>. ' R Tq y-dendrites -. ~:,~ . J , J f - x 25 •• Figure 4 R Tq d = 400 fLm 0,1°C/s 1310°C = 140 fLm x 25 Steel 215 • 49 STEEL 215. 2721 Composition (wt-%) C Si Mn p S Cr Ni Mo Cu v 0,55 0,27 0,50 0,019 0,012 0,99 3,0 0,31 0,06 0,08 fs Thermal Analysis 0,0 0,2 0,4 0,6 N 0,8 0,011 0,008 1,0 dT de T (OCl (OC/s) 1500 +',5 T 1450 0 1400 dT d't' 1350 -1,5 R = O,5°C/s 1300 100 0 200 Average Liquidus temperature, Temperature Solidus austenitic of formation temperature, °C primary of eutectic, CD phase, °C CD °C 300 T(s) Cooling Rate,R, (OC/s) 2,0 0,5 0,1 1471 1471 1472 1365-1335 1335 -1370 1370 -1375 1375 Solidification range, °C 140 100 75 Solidification time, s 100 260 720 Precipitates Interdendritic carbide-austenite eutectic, Fe3P and MnS, (see figure 5).

I" '.... J' '. : ... ' '\. •. ~. • . ,. \ T" \... - . ,'. ••. • I ~ •• - ".. f.. I J' . "" • # :. f:' ""..... ,'\. ••.. •• ~ A ~ ~ •• _ ". ,~-t. { (. / ~ ". •. _.... ,~ r. • \. Completely solidified ' "'li . ')-. t . ; ~ IAl. \.. '\" \'. r 'l. ''. ". ,tJ- \ ,. • ,,' \. ••• ••. '. • ,,':... '" "'. "' . \ '. ". \ ~,'. •. " ') \. •. • ' ~ . ''. ' \. , ',," ' . ' . :-, • '. •. ). ~. :'-.. ••••.. '. '. \- x 25 >"":'. ''lo. , " '. ~.

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