Browse > Article
http://dx.doi.org/10.5781/JWJ.2017.35.1.26

Effect of Post-Weld Heat Treatment on the Mechanical Properties and Microstructure of P-No. 1 Carbon Steels  

Lee, Seung-Gun (Joining Technology Department, Korea Institute of Materials Science)
Kang, Yongjoon (Joining Technology Department, Korea Institute of Materials Science)
Kim, Gi-Dong (Joining Technology Department, Korea Institute of Materials Science)
Kang, Sung-Sik (Dept. of Nuclear Safety Research, Korea Institute of Nuclear Safety)
Publication Information
Journal of Welding and Joining / v.35, no.1, 2017 , pp. 26-33 More about this Journal
Abstract
This study aims to investigate the suitability of requirement for post-weld heat treatment(PWHT) temperature when different P-No. materials are welded, which is defined by ASME Sec. III Code. For SA-516 Gr. 60 and SA-106 Gr. B carbon steels that are typical P-No. 1 material, simulated heat treatment were conducted for 8 h at $610^{\circ}C$, $650^{\circ}C$, $690^{\circ}C$, and $730^{\circ}C$, last two temperature falls in the temperature of PWHT for P-No. 5A low-alloy steels. Tensile and Charpy impact tests were performed for the heat-treated specimens, and then microstructure was analyzed by optical microscopy and scanning electron microscopy with energy-dispersive spectrometry. The Charpy impact properties deteriorated significantly mainly due to a large amount of cementite precipitation when the temperature of simulated heat treatment was $730^{\circ}C$. Therefore, when dissimilar metal welding is carried out for P-No. 1 carbon steel and different P-No. low alloy steel, the PWHT temperature should be carefully selected to avoid significant deterioration of impact properties for P-No. 1 carbon steel.
Keywords
P-No. 1 carbon steel; Post-weld heat treatment; Impact toughness;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 G.M. Evans, The Effect of Stress Relieving on the Microstructure and Properties of C-Mn All-Weld Metal Deposits, Weld. J., 65-12 (1986), 326s-334s
2 A.G. Olabi and M.S.J. Hashmi, The Effect of Post-Weld Heat-Treatment on Mechanical-Properties and Residual-Stresses Mapping in Welded Structural Steel, J. Mater. Process Tech., 55 (1995), 117-122   DOI
3 H.-T. Kim and S.-C. Kil, Trends of Welding Technologies (Heat Treatment), Journal of KWS, 21 (6) (2003), 3-11 (in Korean)
4 S.-S. Kang and Y.-J. Lee, Procedure of PWHT in Actual Welding Industry, Journal of KWS, 21 (6) (2003), 12-15 (in Korean)
5 S.-S. Kang and Y.-J. Lee, PWHT of Joint in Dissimilar Materials, Journal of KWS, 21 (6) (2003), 16-19(in Korean)
6 S. Paddea, J.A. Francis, A.M. Paradowska, P.J. Bouchard and I.A. Shibli, Residual Stress Distributions in a P91 Steel-Pipe Girth Weld before and after Post Weld Heat Treatment, Mat. Sci. Eng. A, 534 (2012), 663-672   DOI
7 J.H. Kim and E.P. Yoon : Notch Position in the HAZ Specimen of Reactor Pressure Vessel Steel, J. Nucl. Mater., 257 (1998), 303-308   DOI
8 Y.-S. Ahn, H.-D. Kim, T.-S. Byun, Y.-J. Oh, G.-M. Kim and J.-H. Hong, Application of Intercritical Heat Treatment to Improve Toughness of SA508 Cl.3 Reactor Pressure Vessel Steel, Nuclear Engineering and Design, 194 (1999), 161-177   DOI
9 D. Lonsdale and P.E.J. Flewitt, The Role of Grain Size on the Ductile-Brittle Transition of a 2.25 Pct Cr-1 Pct Mo Steel, Metall. Trans. A, 9 (1978), 1619-1623   DOI
10 Y.M. Kim, S.K. Kim, Y.J. Lim and N.J. Kim, Effect of Microstructure on the Yield Ratio and Low Temperature Toughness of Linepipe Steels, ISIJ Int., 42 (2002), 1571- 1577   DOI
11 B. Hwang, Y.G. Kim, S. Lee, Y.M. Kim, N.J. Kim and J.Y. Yoo, Effective Grain Size and Charpy Impact Properties of High-Toughness X70 Pipeline Steels, Metall. Mater. Trans. A, 36 (2005), 2107-2114   DOI
12 H. Qiu, T. Hanamura and S. Torizuka, Influence of Grain Size on the Ductile Fracture Toughness of Ferritic Steel, ISIJ Int., 54 (2014), 1958-1964   DOI
13 A. Cabral, A.W. Thompson, I.M. Bernstein and D.H. Stone, The Thermal Fatigue Behavior of Near-eutectoid Steel, Materials Science and Engineering, 93 (1987), 73-82   DOI
14 Y. Peng, H. Xu and M. Zhang, Effects of Simulated On-Fire Processing Conditions on the Microstructure and Mechanical Performance of Q345R Steel, International Journal of Minerals, Metallurgy and Materials, 23 (2016), 49-56   DOI
15 R. Song, D. Ponge, D. Raabe and R. Kaspar, Microstructure and Crystallographic Texture of an Ultrafine Grained C-Mn Steel and their Evolution during Warm Deformation and Annealing, Acta Mater., 53 (2005), 845-858   DOI
16 B.K. Choudhary, C. Phaniraj, K. Bhanu Sankara Rao and S.L. Mannan, Creep Deformation Behaviour and Kinetic Aspects of 9Cr-1Mo Ferritic Steel, ISIJ Int., 41 (2001), s73-s80   DOI
17 A. Karmakar, M. Mandal, A. Mandal, M. B. Sk, S. Mukherjee and D. Chakrabarti, Effect of Starting Microstructure on the Grain Refinement in Cold-Rolled Low-Carbon Steel During Annealing at Two Different Heating Rates, Metall. Mater. Trans. A, 47 (2016), 268-281   DOI