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이종 마찰용접 강봉재의 후열처리에 따른 기계적 특성

Mechanical Properties of Dissimilar Friction Welded Steel Bars in Relation to Post Weld Heat Treatment

Abstract

Dissimilar friction welding were produced using 15(mm) diameter solid bar in chrome molybedenum steel(KS SCM440) to carbon steel(KS S45C) to investigate their mechanical properties. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Vickers hardness surveys of the bond of area and H.A.Z and microstructure investigations. The specimens were tested as-welded and post-weld heat treated(PWHT). The tensile strength of the friction welded steel bars was increased up to 100% of the S45C base metal under the condition of all heating time. Optimal welding conditions were n=2,000(rpm), $P_1=60(MPa),\;P_2=100(MPa),\;t_1=4(s),\;t_2=5(s)$ when the total upset length is 5.4 and 5.7(mm), respectively. The peak of hardness distribution of the friction welded joints can be eliminated by PWHT. Two different kinds of materials are strongly mixed to show a well-combined structure of macro-particles without any molten material and particle growth or any defects.

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참고문헌 (10)

  1. AWS, 1991, 'Welding Handbook,' Vol. 2, pp. 747, pp. 672-763 
  2. AWS, 1981, 'Welding Handbook,' Vol. 1, Fundamentals of Welding,' 7th edition, Vol. 1, pp. 153-220 
  3. Suh, C. M., Suh, D. Y. and Lee, D. J., 1995, 'A Study on Fatigue Strength in the Friction Welded Joints of HSS-Co to SM55C Catbon Steel(1),' Trans. of the KSME(A), Vol. 19, No. 4, pp. 918-928 
  4. Suh, C. M., Suh, D. Y. and Lee, D. J., 1995, 'A Study on Fatigue Strength in the Friction Welded Joints of HSS-Co to SM55C Catbon Steel(2),' Trans. of the KSME(A), Vol. 19, No. 4, pp. 929-940 
  5. Tsuchiya, K. and Kawamura, H., 1996, 'Mechanical Properties of Cu-Cr-Zr Alloy and SS316 Joints Fabricated by Friction Welding Method,' Journal of Nuclear Materials, Vol. 233, No. 237, pp. 913-917 
  6. Oh, S. K., Kong, Y. S., Yoo, I. J. and Kim, I. S., 2000, 'Creep Life Prediction for Dissimilar Friction-Welded-Joints of Turbine Impeller Heat Resisting Steels and AE Evaluation(1)-FRW and AE Evaluation,' Proc. of International Offshore and Polar Eng. Conf., ISOPE, pp. 203-207 
  7. Jeong, H. S. and Shinoda, T., 1997, 'Fundamental and Basic Application of Friction Welding,' Journal of KWS, Vol. 15, No. 6, pp. 1-12 
  8. Kang, S. B. and Min, T. K., 1988, 'A Study on the Friction Weldability of Carbon Steel(S45C) to Aluminum Alloy(A6063),' Journal of KWS, Vol. 16, No. 2, pp. 153-220 
  9. Oh, S. K., Kim, B. A., Kim, S. J. and Nam, S. H., 1988, 'A Study on Friction Welding of SM45C to SCM4 Steel Bars and the Fatigue Properties,' Journal of KSOE, Vol. 2, No. 2, pp. 312-321 
  10. Cho, H. S. and Suh, S. J., 1997, 'Friction Welding of Inconel 713C and SCM440,' Journal of KWS, Vol. 15, No. 6, pp. 78-84 

이 논문을 인용한 문헌 (5)

  1. Kwon, Sang-Woo ; Kong, Yu-Sik ; Kim, Seon-Jin 2008. "Optimization of Friction Welded Joint Conditions in Alloy718 and the Nondestructive Evaluation" 韓國海洋工學會誌 = Journal of ocean engineering and technology, 22(1): 53~57 
  2. Kim, Seon-Jin ; Kong, Yu-Sik ; Lee, Sang-Yeal 2009. "Weibull Statistical Analysis of Micro-Vickers Hardness using Monte-Carlo Simulation" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 33(4): 346~352 
  3. Kong, Yu-Sik ; Yun, Seong-Pil ; Kim, Seon-Jin 2010. "Mechanical Properties of Friction Welded SM 45C-SF 45 Joints for Automobile Reverse Idle Gear Shaft Applications" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 34(1): 85~90 
  4. Kong, Yu-Sik ; Lee, Jin-Kyung ; Kang, Dae-Min 2011. "Friction Welding and AE Characteristics of Magnesium Alloy for Lightweight Ocean Vehicle" 韓國海洋工學會誌 = Journal of ocean engineering and technology, 25(6): 91~96 
  5. Kong, Yu-Sik ; Park, Young Whan 2014. "Mechanical Property and Process Variables Optimization of Tube-to-Tube Friction Welding for Steel Pipe with 36 mm External Diameter" 한국동력기계공학회지 = Journal of the korean society for power system engineering, 18(2): 50~56 

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