| Title： | Revealing effect of aluminum alloying on work hardening and impact behaviors of low-density Fe-18Mn-1.3C-2Cr-(4, 11)Al casting steel | |
| Author： | Zhi-bin Zheng1, *Hao-kun Yang2, A. P. Shatrava3, Wai-wah Lai2, Jun Long1, 4, and Kai-hong Zheng1, 4 | |
| Address： | 1. Institute of New Materials, Guangdong Academy of Sciences, Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China; 2. Smart Manufacturing Division, Hong Kong Productivity Council, Hong Kong 999077, China; 3. Physicotechnological Institute of Metals and Alloys, National Academy of Sciences, Kiev 03142, Ukraine; 4. National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Guangdong Provincial Iron Matrix Composite Engineering Research Center, Guangzhou 510650, China | |
| Key words： | casting steel; aluminum; work hardening; impact toughness; tensile fractography; impact fractography | |
| CLC Nmuber： | TG142 | |
| Document Code： | A | |
| Article ID： | 1672-6421(2022)04-359-10 | |
| Abstract： |
The present study designed two kinds of Fe-18Mn-1.3C-2Cr-(4, 11)Al (wt.%) low-density steels. Tensile and impact tests were carried out to evaluate the work hardening and impact toughness properties via aluminum (Al) alloying control. Meanwhile, microstructure evolution and fracture morphology were investigated by X-ray diffraction (XRD), a scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD), a transmission electron microscope (TEM), and a stereo-optical microscope (OM). It is found that the Al addition obviously promotes the dislocation planar slipping, resulting in cleavage and brittle impact fracture in 11wt.% Al steel. Besides, the microband-induced plasticity (MBIP) mechanism is found in 4wt.% Al containing steel, introducing considerable work hardening capacity and impact toughness of 156.8±17.4 J. The present study provides a direct illustration of the relationship between work hardening and impact toughness behaviors of these two low-density steels for potential application as impact-resistant components.
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