Effect of Molybdenum addition on hardenability of Chromium-Boron steels used for hot stamping applications

  • Deepa Murugesan R & D centre for Iron and steel, Steel Authority of India Ltd
  • Gadadhar Sahoo R & D centre for Iron and steel, Steel Authority of India Ltd
  • Sanjay Kumar Dhua R & D centre for Iron and steel, Steel Authority of India Ltd

Abstract


Two laboratory heats of low-Carbon low-alloy steels, one with boron and chromium additions and other  with  boron,  chromium  and  molybdenum additions  were  made  and  cast  into  pencil   ingots. These ingots were hot-rolled to 2 mm sheets suitable for hot stamping application in an experimental rolling mill. A detailed study was made on the effect of various alloying elements on the microstructure and mechanical properties of these steels. A significantly higher hardness (~496 VHN), yield strength (~1137 MPa) and ultimate tensile strength (~1673 MPa) with comparable elongation (~6%) could be achieved in the as rolled and water-quenched Mo-Cr-B steel in comparison to Cr-B steel under similar processing condition. Moreover, a reduction of critical cooling rate by10 0C/s was observed in this steel to obtain fully martensitic structure. The combined addition of boron, chromium and molybdenum was found to be more effective than that of boron and chromium in enhancing the microstructure and mechanical properties of boron-added steels. Additionally, a few hot compression tests were carried out to simulate the hot stamping process of these experimental steels. It was found that one of the hot stamping process parameters, viz, prior strain had a greater impact on the transformation    behaviour    of    Cr-B    and    Mo-Cr-B    steels during cooling.

Author Biographies

Deepa Murugesan, R & D centre for Iron and steel, Steel Authority of India Ltd
Physical metallurgy
Gadadhar Sahoo, R & D centre for Iron and steel, Steel Authority of India Ltd
Physical metallurgy

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Published
2018/12/27
How to Cite
Murugesan, D., Sahoo, G., & Dhua, S. K. (2018). Effect of Molybdenum addition on hardenability of Chromium-Boron steels used for hot stamping applications. Journal of Mining and Metallurgy, Section B: Metallurgy, 54(3), 339. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/17272
Issue
Vol. 54 No. 3 (2018)
Section
Original Scientific Paper

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