Formability, Microstructure and Properties of C x CrNiV Low-Alloy Steel Fabricated by Laser Melting Deposition
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JMEPEG https://doi.org/10.1007/s11665-020-05027-x
Formability, Microstructure and Properties of CxCrNiV Low-Alloy Steel Fabricated by Laser Melting Deposition M.E. Zhang, S. Zhang, X. Cui, C.H. Zhang, J. Chen, and J.B. Zhang (Submitted April 20, 2020; in revised form June 21, 2020) In this paper, three CrNiV series low-alloy steel with different C contents were fabricated by laser melting deposition (LMD) technique. Subsequently, the formability, microstructure and properties of LMD CxCrNiV low-alloy steel were evaluated. The results are as follows: with the increase in C content, the formability of low-alloy steel has decreased. All the samples were mainly composed of a-Fe (martensite) phase, and carbides were found to be dispersively distributed in the microstructure. As the C content increased, the martensite lath was remarkably refined, and the average grain size decreased from 2.76 to 2.33 lm. The tensile strength of the deposited samples increased by 21.58%, and the yield strength increased by 44.68%. As the formability of the deposited sample decreased, the elongation decreased by 35.93%. The average microhardness of deposited samples increased by 26.76%. When the content of C is higher, abrasion-resistant framework can be formed between carbides, and the peeling phenomenon during wear will be greatly reduced, the wear resistance is improved by 86.78%. Keywords
CrNiV low-alloy steel, friction and wear, laser melting deposition, microstructure, tensile properties
1. Introduction LMD technique is a superior laser additive manufacturing (LAM) technology and a new type of rapid prototyping technology (Ref 1, 2). This technique subverted the traditional concept of forming a subtractive manufacturing. Starting from the bottom, the powder is directly added layer by layer to form a workpiece under the action of a laser (Ref 3). This technique has a series of advantages such as short processing cycle, high precision of workpieces, and environmental protection (Ref 4, 5). It is widely used in high-value components, aerospace, large-scale engineering and other fields (Ref 6-9). Chromium–nickel alloy steel is a material which is widely used in key parts of high-speed rail, nuclear power and other fields (Ref 10, 11). Zhou et al. (Ref 12) successfully prepared 12CrNi2 alloy steel by LMD technique and obtained the deposited sample with superior comprehensive mechanical properties (ultimate tensile strength: 757 MPa, elongation: 9.1%). This work also showed that increasing the laser power can increase the ratio of the large-angle grain boundaries and effectively improve the impact toughness of the deposited samples. Guan et al. (Ref 13) added rare earth element Yttrium on the basis of 12CrNi2 and the effect of energy area density (EAD) on organization and performance was also studied. Under the optimized EAD conditions, the materials obtained has high
M.E. Zhang, S. Zhang, X. Cui, and C.H. Zhang, School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, PeopleÕs Republic of
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