Abstract
To obtain the wear-resistant camshaft with surface rigidity and core toughness and improve the service life of camshaft, wear-resistant Fe-based alloy gradient material was prepared by laser melt deposition. The traditional camshaft was forged by 12CrNi2V. In this paper, four types of wear-resistant Fe-based powders were designed by introducing various content of Cr3C2 and V-rich Fe-based alloy (FeV50) into stainless steel powder. The results showed that the gradient materials formed a satisfactory metallurgical bond. The composition of the phases was mainly composed of α-Fe, Cr23C6, and V2C phases. The increasing of Cr3C2 and FeV50 led to transform V2C into the V8C7. The microstructures were mainly cellular dendrite and intergranular structure. Due to the addition of Cr3C2 and FeV50, the average microhardness and wear resistance of gradient materials were significantly better than that of 12CrNi2V. The sample with 8% V had the highest microhardness of 853 ± 18 HV, which was 2.6 times higher than that of 12CrNi2V. The sample with 6% V had the best wear resistance, which was 21 times greater than that of 12CrNi2V.
Highlights
As one of the core components of the diesel engine, the camshaft faces many challenges in terms of quality [1]
functionally graded material (FGM) have been widely studied for their excellent mechanical properties [6,7,8]
FGMs have different properties on both sides of the similar material, which fully met the requirements of camshaft surface rigidity and core toughness
Summary
As one of the core components of the diesel engine, the camshaft faces many challenges in terms of quality [1]. The microhardness of the gradient region with the change of chemical composition. The gradient materials had acceptable metallurgical bonding the step decreased with the increase of the deposited layer. The microhardness of increase the gradient material varies withwas the change of theThe composition. [23] studied the materials effect of dilution of Al and on theshowed deposition the high dilution ratio makes the powder and matrix fully mixed, and contributes to the. The makes the powder and matrix fully mixed, and contributes to the homogenization of solidification microhardness and elastic modulus obtained by nanoindentation tests increased gradually from Ti microstructure. To obtain a camshaft with surface rigidity and low core toughness, Fe-based gradient materials were prepared by LMD technology using 12CrNi2V core toughness, Fe-based gradient materials were prepared by technology using. The constituent phase, microstructure, microhardness, and wear resistance were studied
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