Page 42 - Steel Tech India eMagazine Volume October 2023
P. 42
92/ Ć ,668( Ć 2FWREHU
'HYHORSPHQW RI 7KLUG *HQHUDWLRQ $+66 8VLQJ
0HGLXP 0DQJDQHVH 6WHHO WKURXJK $XVWHQLWH
5HYHUWHG 7UDQVIRUPDWLRQ +HDW 7UHDWPHQW &\FOH
b
*a
a
J N Mohapatra , M Vidhyaysagar , D Satish Kumar and Rameshwar Sah a
a -6: 6WHHO /WG 9LMD\DQDJDU :RUNV 7RUDQDJDOOX %HOODU\ .DUQDWDND ,1',$
b -6: 6WHHO /WG 6DOHP :RUNV 7DPLO 1DGX ,1',$
$EVWUDFW advanced high strength steels > @ . The excellent
$ ORZ FDUERQ & PHGLXP PDQJDQHVH properties develops in the steels due to the presence
0Q VWHHO ZLWK $O RI FRPSRVLWLRQ ZDV FDVW RI PHWDVWDEOH DXVWHQLWH ZKLFK WUDQVIRUPV WR PDUWHQVLWH
DQG FRQYHUWHG WR PP WKLFN ZURXJKW VWHHO ZDV ZKLOH GHIRUPDWLRQ FDOOHG DV 75,3 HႇHFW $ GHWDLO UHYLHZ RQ
VXEMHFWHG WR UH DXVWHQLWL]HG WUHDWPHQW EHWZHHQ WKH PHGLXP PDQJDQHVH VWHHOV ZLWK WKHLU PLFURVWUXFWXUH
DQG R& ZLWK R& VWHS IRU PLQXWH DQG DLU and properties is reported in literature > @ . The steels
FRROHG 'XH WR WKH DXVWHQLWH UHYHUWHG WUDQVIRUPDWLRQ DIWHU IRUJLQJ DQG DLU FRROLQJ JLYHV ORZHU YROXPH IUDFWLRQ
EHWZHHQ WR R& \LHOG VWUHQJWK LQ WKH UDQJH RI UHWDLQHG DXVWHQLWH GXH WR WKH IRUPDWLRQ PDUWHQVLWH LQ
WR 03D XOWUD KLJK WHQVLOH VWUHQJWK LQ WKH UDQJH WKH VWHHO ZKLOH LQWHU FULWLFDO DQQHDOLQJ DW ORZ WHPSHUDWXUH
WR 03D ZLWK WR HORQJDWLRQ OHDGLQJ WR GLVVROXWLRQ RI FDUELGHV IXUWKHU GHFUHDVHV WKH
UHVXOWLQJ WKH SURGXFW RI XOWLPDWH WHQVLOH VWUHQJWK DQG PDWUL[ VWUHQJWK ,QWHUFULWLFDO DQQHDOLQJ LQ WKH LQWHUPHGLDWH
DQQHDOLQJ WHPSHUDWXUH OHDGV WR FDUERQ SDUWLWLRQLQJ DQG
GXFWLOLW\ EHWZHHQ DQG *3D FRQIRUPLQJ WKH IRUPDWLRQ RI JOREXODU DXVWHQLWH LVODQGV DW WKH SULRU
WR ¿UVW JHQHUDWLRQ $+66 7KH VWHHO UH DXVWHQLWL]HG DXVWHQLWH JUDLQ ERXQGDULHV ZLWKLQ WKH PDUWHQVLWLF PDWUL[
EHWZHHQ R& JDYH WKH EHVW SURSHUWLHV LQ WKH resulting in increase in ductility and toughness, while
UDQJH RI 03D \LHOG VWUHQJWK VWUHQJWK UHPDLQV XQFKDQJHG ([FHHGLQJ WKH RSWLPXP
03D XOWLPDWH WHQVLOH VWUHQJWK ZLWK LQWHUFULWLFDO DQQHDOLQJ WHPSHUDWXUH OHDGV WR D YROXPH
HORQJDWLRQ DQG WKH SURGXFW RI VWUHQJWK DQG HORQJDWLRQ IUDFWLRQ LQFUHDVH DQG PRUSKRORJ\ FKDQJH RI DXVWHQLWH
EHWZHHQ *3D TXDOLI\LQJ IRU WKLUG JHQHUDWLRQ ZKLFK IRUPV D FRDUVH QHWZRUN . There is a need to
[8]
$+66 7KH VWHHO UH DXVWHQLWL]HG EHWZHHQ DQG XQGHUVWDQG WKH RSWLPXP WHPSHUDWXUH UDQJH ZKHUH WKH
R& VKRZ ORZ \LHOG VWUHQJWK 03D DQG XOWUD third generation AHSS properties could be achieved
high strength level with excellent ductility due to very GXH WR WKH RSWLPXP FRPELQDWLRQ RI PLFURVWUXFWXUDO
KLJK UHWDLQHG DXVWHQLWH ,Q WKH WHPSHUDWXUH UDQJH phases.
WR R& VKRZ XOWUD KLJK VWUHQJWK OHYHO UDQJLQJ ,Q WKH SUHVHQW VWXG\ D ORZ FDUERQ & PHGLXP
EHWZHHQ DQG 03D EXW UHWDLQV UHDVRQDEO\ 0Q VWHHO VWHHO ZLWK $O DIWHU IRUJLQJ
JRRG HORQJDWLRQ EHWZHHQ DQG FRQIRUPLQJ DQG DLU FRROLQJ VXEMHFWHG WR UH DXVWHQLWL]DWLRQ LQ WKH
WR ¿UVW *HQ $+66 +HQFH WKHUH D QDUURZ UDQJH RI WHPSHUDWXUH UDQJH RI WR R& IRU WKH DXVWHQLWH
DXVWHQLWH UHYHUWHG WUDQVIRUPDWLRQ $57 WHPSHUDWXUH UHYHUWHG WUDQVIRUPDWLRQ LQ WKH VWHHO WR DFKLHYH YHUVDWLOH
where the third generation AHSS could be achieved UDQJH RI PLFURVWUXFWXUH DQG PHFKDQLFDO SURSHUWLHV
GXH WR WKH RSWLPXP FRPELQDWLRQ RI PLFURVWUXFWXUDO TXDOLI\LQJ IRU WKLUG JHQHUDWLRQ $+66
SKDVHV RI IHUULWH EDLQLWH PDUWHQVLWH DQG UHWDLQHG (;3(5,0(17$/
DXVWHQLWH LQ WKH PHGLXP PDQJDQHVH VWHHO
7KH VWHHO ZDV DLU LQGXFWLRQ PHOWHG LQ D NJ FDSDFLW\
.H\ ZRUGV 0HGLXP 0Q 6WHHO $XVWHQLWH 5HYHUWHG IXUQDFH IRU FRQYHUVLRQ WR D NJ LQJRW ZKLFK ZDV
7UDQVIRUPDWLRQ 0LFURVWUXFWXUH 0HFKDQLFDO 3URSHUWLHV KHDWHG WR D VRDNLQJ WHPSHUDWXUH R& IRU KRXUV
Third Generation AHSS DQG ZDV IRUJHG WR FRQYHUW WKH FDVW VWHHO WR D ZURXJKW
VWHHO 7KH FDVW LQJRW LV VXEMHFWHG WR UHGXFWLRQ WR D
,1752'8&7,21
¿QDO VL]H RI [ PP ELOOHW 7KH ELOOHWV ZHUH VOLFHG
0HGLXP PDQJDQHVH VWHHOV ZLWK 0Q DUH WKH WR PP WKLFN VWULSV LQ DQ HOHFWULF GLVFKDUJH PDFKLQH
FDQGLGDWHV IRU GHYHORSPHQW RI WKLUG JHQHUDWLRQ ('0 IRU IXUWKHU KHDW WUHDWPHQW LQ D PXႉH IXUQDFH
STEEL TECH
