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Yunlong Xue,Yuxuan Wang,Haohua Sun,Na Feng,Liang Yuan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Three ternary Laves phase-based eutectic alloys CrFeNbx(x = 2.0, 2.35, 2.7) were designed successfully by combining thebinary phase diagrams and thermodynamics calculations. With the increasing Nb content, the solidified microstructuresevolved from the primary (Cr, Fe)2Nb plus the eutectic (Cr, Fe)2Nb/Nbss in the CrFeNb2.0,via the full eutectic (Cr, Fe)2Nb/Nbss in the CrFeNb2.35,and finally to the primary Nbss plus the eutectic (Cr, Fe)2Nb/Nbss in the CrFeNb2.7. The full eutectic(Cr, Fe)2Nb/Nbss of the CrFeNb2.35was found with outstanding thermal stability, and the lamellar eutectic was quitestable even under the heat-treatment of 1273 K/48 h. The compression strength and fracture toughness increased firstly anddecreased subsequently with the increase of Nb content, which reached their maximums of 2.54 GPa and 18.25 MPa·m1/2,respectively, in the CrFeNb2.35. The excellent combination of compression strength and fracture toughness in the CrFeNbx(x = 2.0, 2.35, 2.7) were attributed to the synergistic effects of Laves phase strengthening, interface strengthening, solidsolution strengthening, alloying toughening and Nbss phase toughening mechanisms.
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Jixin Wang,Jianhua Zhang,Yunlong Liang,Yonghai Yang 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"The present paper focuses on the simulation of the non-stationary load histories of engineering vehicles for fatigue tests. For the first time, the characteristics of the service loads experienced by engineering vehicles are described. Then rainflow data-reduction contributing to reduce the testing time and extrapolation of each operating section to generate the unavailable extreme loads in a limit test are carried out. Finally, based on the simulated load history of each operating section using Markov chain Monte Carlo method (MCMC) and the corresponding simulation length generated by the Monte Carlo method, a cyclic simulation approach is proposed to generate nonstationary load histories, by which the cyclic characteristic can be reconstructed well. The results of comparison between the observed and simulated load histories show good agreement."
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