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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29209

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Effect of Heat Input on the Weld Metal Toughness of Chromium-Molybdenum Steel
An attempt has been made to determine the strength and impact properties of Cr-Mo steel weld and base materials by varying the current during manual metal arc welding. Toughness over a temperature range from -32 to 100°C of base, heat affected zone (HAZ) and weld zones at three current settings are made. It is observed that the deterioration in notch toughness at any zone with the temperature decreases. The values of notch toughness for all zones at -32°C are almost same for any current settings. The values of notch toughness at HAZ area are higher than that of weld area due to the coarsening of ferrite grain of HAZ occurs with higher heat input. From microhardness and microstructure result, it can be concluded that large inclusion content in weld deposit is the cause of lower notch toughness value.
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[1] Mohapatra, J. N., Panda, A. K., Gunjan, M. K., Bandyopadhyay, N. R., Mitra, A. and Ghosh, R. N., "Ageing Behaviour Study of 5Cr-0.5Mo Steel by Magnetic Barkhausen Emissions and Magnetic Hysteresis Loop Techniques" NDT & E International, Vol. 23, No. 2, 2007, pp. 173-178.
[2] Kumslytis, V., Skindaras, R. and Valiulis, V., "The Structure and Properties of 5%Cr-0.5%Mo Steel Welded Joints after Natural Ageing and Post-weld Heat Treatment"Materials Science Technologija. ISSN 1392-1320, Vol. 18, no.2, 2012, pp. 119-122.
[3] Sae-teaw N., Poopat B., Phung-on I. and Chairuangsri T., "Analysis of Microstructure in Soft Zone and Precipitation Zone of Dissimilar Cr-Mo Steels Weldment" AIJSTPME, Vol. 3, No. 2, 2010, pp. 57-64.
[4] Muratoglu, M and Eroglu, M., " Effect of molybdenum on the intercritical heat-affected zone of the low carbon Cr-Mo steel", Asian Transaction on Engineering, Vol. 1, No. 4, 2011, pp. 1-5.
[5] Srivastava, B. K., Tewari, S. P. and Prakash, J., "A review on effect of preheating and/or post weld heat treatment (PWHT) on mechanical behavior of ferrous metals", International Journal of Engineering Science and Technology, Vol. 2, No. 4, 2010, pp. 625-631.
[6] Yoshihiro, S., Kohsuke, H. and Hisaya, K. .,"Welding heat-input limit of rolled steels for building structures based on simulated HAZ tests", Transactions of JWRI, Vol. 30, No. 1, 2001, pp. 127-134.
[7] Miche, J., Bursak, M and Vojtko, M. ., "Microstructure and mechanical properties degradation of CrMo creep resistant steel operating under creep conditions", Journal of Materials Engineering, Vol. 18, 2011, pp. 57-62.
[8] Peddle, B. E. and Pickles, C. A., "Carbide and hardness development in the heat- affected zone of tempered and postweld heat-treated 2.25Cr- 1Mo steel weldments", J. Mater. Eng. Perform. Vol. 9, No. 5, 2000, pp. 477-488.
[9] Tammasophon, N., Homhrajai, W. and Lothongkumi, G., "Effect of Postweld Heat Treatment on Microstructures and Hardness of TIG Weldment between P22 and P91 Steels with Inconel 625 Filler Metal", Journal of Metals, Materials and Minerals, Vol.21 No.1, 2011, pp.93-99.
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