High strength Hadfield steel produced using laser powder bed fusion of mixed powders

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High strength Hadfield steel produced using laser powder bed fusion of mixed powders
Title:
High strength Hadfield steel produced using laser powder bed fusion of mixed powders
Journal Title:
Materials & Design
Keywords:
Publication Date:
20 May 2023
Citation:
Cheng, B., Wei, F., Teh, W. H., Cheong, K. H., Lee, J. J., Chew, L. T., Lau, K. B., Ma, T. H. B., Ng, C. K., Wang, P., Ramamurty, U., & Tan, C. C. (2023). High strength Hadfield steel produced using laser powder bed fusion of mixed powders. Materials & Design, 231, 112017. https://doi.org/10.1016/j.matdes.2023.112017
Abstract:
Hadfield steel (HS) with ~ 0.83 wt% Carbon has been manufactured using the laser powder bed fusion (LPBF) of mixed Fe-Mn, pure-Fe and Fe-C powders. Results show that the as-fabricated alloy is fully austenitic with the absence of carbides—a typical feature in the cast alloy that necessitates its solutionizing and quenching. The C loss during fabrication is very small, offering an accurate composition control. The strength (y= 595.5 ± 18.1 MPa, u= 950.2 ± 28.6 MPa) and hardness (318.6 ± 7.1 HV) of the LPBF HS are superior to those of the conventionally fabricated alloy, while the impact toughness is similar, and ductility is inferior. The yield strength enhancement is mainly due to the refinement in the grain size and increase in the dislocations, which occurs due to the rapid solidification conditions that prevail during LPBF. This rapid solidification also prevents carbide formation and retain the main alloying elements (C and Mn) in solution. Thus conventional water quenching process can be completely eliminated.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the A*STAR - Structural Metal Alloy Program (SMAP)
Grant Reference no. : A18B1b0061
Description:
ISSN:
0264-1275