A guide to the Solidification of Steels by Jernkontoret

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By Jernkontoret

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F \ . '. \ '. \ ,"'. •• " I ! • /' I I ~ ,, '\' • ), \'1. -, ~ I' , ~ liquid (L). "" ... f ,... ,I R = 2,0°C/s Tq = 1310°C d = 75 fLm Figures 2-4: y-dendrites. fLm x 25 ~ " J ( . •. -. ') .. Figure 2 ". •. I "" : , • •• . I ~ . ,; ,. ~ "... r , J ••• } 55 fLm '. ).. ). I I. \ • " . \ I \ \ \ , \ I"- \ lo = 1470°C \ \ \ \ \ I \ . , = \ '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.

2. Interdendritic MnS. Microsegregation Element Cr 2,6 R = 0,5 cCls Tq = 1250 cC remained after cooling to 850 DC (see Partly solidified Figure 1 R Tq = 1440°C = 0,5°C/s d = 60 y-dendrites JLm and quenched liquid (L). x 25 400 JLm x 25 400 JLm Completely solidified Figure 2 R = 2,0°C/s Tq = 1250°C d = 75 JLm Figures 2-4: y-dendrites. ,... ,. ' . •• • p ~ • ~. •.. , ;' ' I ~:~ J y ,0" ". •.. -1 .. , V .. ~ f . ~~ #': . - ? •.. '" Figure 5 R = 2,0°C/s Tq = 1250°C Interdendritic Fe3P-carbide-austenite eutectic (E) (approximately 0,1 vol-%).

0,004 0,002 1,0 0,8 dT dt CD t 1450 (QC/s) T +1,5 +1,0 1400 +0,5 0 1350 -0,5 1300 -1,0 -1,5 R = O,soC/s 1250 0 100 Average Liquidus Solidus temperature, temperature, Solidification austenitic °C CD primary phase, cC CD range, °C Solidification time, s Precipitates 1. MnS 2. Interdendritic eutectic « 0,05 vol. Lrn y-dendrites and quenched liquid (L). Lrn .. •~.. t '. i.. ... ~ Completely solidified I : " ;' ". \. Y~ •.. , " '" . 1 '. Lrn Figures 2-4: y-dendrites. '.. ' 1- ; • " " . ) \. ' ;~, ..

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