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Acta Metall Sin  2014, Vol. 50 Issue (12): 1413-1420    DOI: 10.11900/0412.1961.2014.00306
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EFFECT OF INDUCTION TEMPERING ON CARBIDE PRECIPITATION BEHAVIOR AND TOUGHNESS OF A 1000 MPa GRADE HIGH STRENGTH LOW ALLOY STEEL
FANG Yupei, XIE Zhenjia, SHANG Chengjia
School of Materials Science and Engineering, University Science and Technology Beijing, Beijing 100083
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Abstract  By comparing induction tempering with conventional tempering, the effect of induction reheating tempering on carbide precipitation behavior and toughness of a 1000 MPa grade high strength low alloy steel was investigated. Microstructures of the steel in different heat treatment stages were characterized using SEM and TEM (with EDS), mechanical properties inclusive of Vickers hardness and toughness were tested. The results showed that microstructure of quenched samples consisted of lath martensite and lower bainite, needle like carbides were observed in lower bainitic lath. With tempering temperature increasing from 400 ℃ to 550 ℃, the shape of carbides located within the bainitic lath gradually changed from needle like to short rod like type. Carbides were fine and well distributed using induction tempering. When the tempering temperature was 550 ℃, the long axis length of short rod like carbides located within the bainitic lath by conventional reheating tempering was 200 nm, whereas the long axis length of short rod like carbides located within the bainitic lath by induction reheating tempering was about 60 nm. When tempering by conventional reheating, carbides mainly precipitated along martensite lath boundaries, while carbides were more dispersed in the matrix lath by induction reheating, the size of these dispersed carbides was less than 100 nm when tempering temperature was 550 ℃. As a result, a superior of mechanical properties with 344 HV and Charpy impact energy of 133 J at -20 ℃ was obtained with induction reheating tempering at 550 ℃.
Key words:  high strength low alloy steel      induction tempering      toughness      nano-sized carbide     
Fund: ; Supported by National Basic Research Program of China (No.2010CB630801)
Corresponding Authors:  Correspondent: SHANG Chengjia, professor, Tel: (010)62332428, E-mail: cjshang@ustb.edu.cn   
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FANG Yupei, XIE Zhenjia, SHANG Chengjia. EFFECT OF INDUCTION TEMPERING ON CARBIDE PRECIPITATION BEHAVIOR AND TOUGHNESS OF A 1000 MPa GRADE HIGH STRENGTH LOW ALLOY STEEL. Acta Metall Sin, 2014, 50(12): 1413-1420.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00306     OR     https://www.ams.org.cn/EN/Y2014/V50/I12/1413

Fig.1  

Low (a) and locally high (b, c) magnified SEM images of the experimental steel after quenching

Fig.2  

SEM images within the bainitic lath of the specimens tempered with conventional tempering (a, c, e) and induction tempering (b, d, f) at 400 ℃ (a, b), 480 ℃ (c, d) and 550 ℃ (e, f)

Fig.3  

SEM images on the matensite lath boundary of the specimens tempered with conventional tempering (a, c, e) and induction tempering (b, d, f) at 400 ℃ (a, b), 480 ℃ (c, d) and 550 ℃ (e, f)

Fig.4  

TEM images of the as-quenched specimens (a, b) and tempered at 550 ℃ with induction tempering (c, d) and conventional tempering (e, f)

Fig.5  

Relationship between hardness (a), -20 ℃ impact energy AKV (b) and tempering temperature of the specimens tempered with conventional tempering and induction tempering

Fig.6  

Axis ratio of the carbide precipitates within the lath in different tempering temperature with conventional tempering and induction tempering

Fig.7  

TEM images of the replica-specimens as-quenched (a) and tempered at 550 ℃ with induction tempering (b) and EDS of the carbide marked by circle in Fig.7b (c)

Fig.8  

SEM images of fracture surface in the specimens tempered at 550 ℃ with induction tempering (a) and conventional tempering (b)

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