Welding method for high crack sensitivity of Q&T steel

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.176959

Keywords:

austenite, brittling, coarsening, crack, cracking, hardening, martensite, quenching, refining, weldability

Abstract

Components for combat vehicles need (such as body panzers, main battle tank, armored personnel carrier) to be made of high strength and hardness steel. However, during and after the welding process is complete, this steel often leaves cracks. Quenched and Tempered Steel is made of Hot Rolled Plate Steel (thickness 8 mm), which is heat-treated with quench and temper to increase strength and hardness. The novelty of this research is the welding method to create a welded joint consisting of fine structure, high strength, and high hardness produced. This joint is produced by manual gas metal arc welding. The scheme of investigation: a) The first step. Preparation of welded specimen 120×100×8 mm in size (Fig. 3). The specimen is divided into five parts, each is given code SS (without heat treatment), S750 (heating at 750 °C), S800 (heating at 800 °C), S850 (heating at 850 °C) and S900 (heating at 900 °C). Heating rate used=10 °C/minutes. b) The second step. Heating specimen S750 at 750 °C and holding for 30 minutes, then quenching in the water medium. The same way applied to specimens S800, S850, and S900. c) The third step. The observation of metallography, hardness, and impact energy was done for SS, S750, S800, S850, and S900. d) The fourth step. Removing the first layer of the weld in half-plate thickness using a hand grinding machine of each specimen, and continue to the second layer welding. e) The fifth step. The second layer of the welds is ground in half and proceed to the final welding. f) The sixth step. Discussion of observations. g) The seventh step. Conclusions.

The results of the tests carried out on KSTA 500 Steel include the chemical composition of base metal; microstructure and hardness for standard and water quenched weld joint. Medium carbon steel is equivalent to Quenched and Tempered Steel used in this study and has a high cracking susceptibility.

The microstructure for the standard welded joint is dominated by martensite when quenched and tempered steel made, and martensite produced when water quenched heat treatment is conducted on the welded joint.

Water quenched weld joint shows the finer microstructure of the heat-affected zone, but weld metal tends to be coarse and brittle. The highest hardness is achieved after 850 °C water quenching, i. e., base metal=578 VHN, heat affected zone=555 VHN, fusion line=457 VHN, and weld metal=252 VHN.

Supporting Agencies

  • The authors would like to thanks to Mr. Agus Kusmanto
  • who at the time was Head Department of Production 1
  • Division of Special Vehicles
  • PT. Pindad (Persero)
  • Indonesia
  • for their support of materials in this study.

Author Biographies

Yurianto Yurianto, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Master of Technical Sciences, Associate Professor

Department of Mechanical Engineering

Pratikto Pratikto, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Doctor of Technical Sciences, Professor

Department of Mechanical Engineering

Rudy Soenoko, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Doctor of Technical Sciences, Professor

Department of Mechanical Engineering

Wahyono Suprapto, Brawijaya University Jl. Mayjend Haryono, 167, Malang, Indonesia, 65145

Doctor of Technical Sciences, Professor

Department of Mechanical Engineering

References

  1. Demir, T., Übeyli, M., Yıldırım, R. O. (2008). Effect of Hardness on the Ballistic Impact Behavior of High-Strength Steels Against 7.62-mm Armor Piercing Projectiles. Journal of Materials Engineering and Performance, 18 (2), 145–153. doi: https://doi.org/10.1007/s11665-008-9288-3
  2. Bailey, N., Coe, F. R., Googh, T. G., Hart, P. H. M., Jenkins, N., Pargetter, R. J. (1973). Welding steels without hydrogen cracking. Abington Publishing and ASM International.
  3. Datta, R., Mukerjee, D., Jha, S., Narasimhan, K., Veeraraghavan, R. (2002). Weldability Characteristics of Shielded Metal Arc Welded High Strength Quenched and Tempered Plates. Journal of Materials Engineering and Performance, 11 (1), 5–10. doi: https://doi.org/10.1361/105994902770344321
  4. ASM Handbook. Properties and Selection: Irons, Steels, and High Performance Alloys. Vol. 6. Copyright ASM International, 1996, 246–247.
  5. Jefferson, T. B.; O’brien, R. L. (Ed.) (1997). Jefferson’s Welding Encyclopedia. American Welding Society, 758.
  6. Yue, X., Lippold, J. C., Alexandrov, B. T., Babu, S. S. (2012). Continuous Cooling Transformation Behavior in the CGHAZ of Naval Steels. Welding Journal, 91 (3), 67S–75S.
  7. Mani, E., Udhayakumar, T. (2018). Effect of prior austenitic grain size and tempering temperature on the energy absorption characteristics of low alloy quenched and tempered steels. Materials Science and Engineering: A, 716, 92–98. doi: https://doi.org/10.1016/j.msea.2018.01.020
  8. Yang, J., Song, Y., Lu, Y., Gu, J., Guo, Z. (2018). Effect of ferrite on the hydrogen embrittlement in quenched-partitioned-tempered low carbon steel. Materials Science and Engineering: A, 712, 630–636. doi: https://doi.org/10.1016/j.msea.2017.12.032
  9. Chen, G., Luo, H., Yang, H., Han, Z., Lin, Z., Zhang, Z., Su, Y. (2019). Effects of the welding inclusion and notch on the fracture behaviors of low-alloy steel. Journal of Materials Research and Technology, 8 (1), 447–456. doi: https://doi.org/10.1016/j.jmrt.2018.04.005
  10. Qasim, B. M., Khidir, T. C., F. Hameed, A., Abduljabbar, A. A. (2018). Influence of heat treatment on the absorbed energy of carbon steel alloys using oil quenching and water quenching. Journal of Mechanical Engineering Research and Developments, 41 (3), 43–46. doi: https://doi.org/10.26480/jmerd.03.2018.43.46
  11. Schumacher, J., Clausen, B., Zoch, H.-W. (2018). Influence of inclusion type and size on the fatigue strength of high strength steels. MATEC Web of Conferences, 165, 14003. doi: https://doi.org/10.1051/matecconf/201816514003
  12. Leister, B. M., Dupont, J. N. (2012). Fracture Toughness of Simulated Heat-Affected Zones in NUCu-140 Steel. Welding Journal, 91, 53-s–58-s.
  13. Shen, S., Oguocha, I. N. A., Yannacopoulos, S. (2012). Effect of heat input on weld bead geometry of submerged arc welded ASTM A709 Grade 50 steel joints. Journal of Materials Processing Technology, 212 (1), 286–294. doi: https://doi.org/10.1016/j.jmatprotec.2011.09.013
  14. Madhusudhan Reddy, G., Mohandas, T., Papukutty, K. . (1998). Effect of welding process on the ballistic performance of high-strength low-alloy steel weldments. Journal of Materials Processing Technology, 74 (1-3), 27–35. doi: https://doi.org/10.1016/s0924-0136(97)00245-8
  15. Yanet, M., Mónica, Z. (2015). Microstructure Characterization of Heat Affected Zone in Single Pass Welding in 9Cr-1Mo Steels. Procedia Materials Science, 8, 904–913. doi: https://doi.org/10.1016/j.mspro.2015.04.151
  16. ASTM E23 - 07a. Standard Test Methods for Notched Bar Impact Testing of Metallic Materials (2007). ASTM International, West Conshohocken, PA. doi: https://doi.org/10.1520/e0023-07a

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Published

2019-08-28

How to Cite

Yurianto, Y., Pratikto, P., Soenoko, R., & Suprapto, W. (2019). Welding method for high crack sensitivity of Q&T steel. Eastern-European Journal of Enterprise Technologies, 4(12 (100), 43–51. https://doi.org/10.15587/1729-4061.2019.176959

Issue

Vol. 4 No. 12 (100) (2019): Materials Science

Section

Materials Science

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Copyright (c) 2019 Yurianto Yurianto, Pratikto Pratikto, Rudy Soenoko, Wahyono Suprapto

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