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; formability; fracture surface 1 Introduction Recently, the lightweight materials have been increasingly applied to automobile components traditionally made of steel in response for reducing fossil fuel... corner of the figure was used for SEM observation after careful cleaning. Figure 14 shows the fracture surface of the sample. Many equal-axis ductile dimples were observed in the figure, which......
J. Cent. South Univ. (2020) 27: 1714-1728 DOI: https://doi.org/10.1007/s11771-020-4402-2 Evaluation of surface roughness and optimization of cutting parameters in turning of AA2024 alloy under... consumption on the surface quality and tool wear was studied. Mathematical models were developed to predict the surface roughness using response surface methodology (RSM). Analysis of variance (ANOVA) was used......
Friction stir processing of thixoformed AZ91D magnesium alloy and fabrication of Al-rich surface CHEN Ti-jun(陈体军), ZHU Zhan-ming(朱战民), LI Yuan-dong(李元东), MA Ying(马 颖), HAO Yuan(郝 远) State Key...-mechanically affected zone were investigated during friction stir processing (FSP) of the thixoformed AZ91D alloy. Simultaneously, an Al-rich surface layer was prepared by combination of Al powder......
J. Cent. South Univ. (2018) 25: 1107-1115 DOI: https://doi.org/10.1007/s11771-018-3810-z A model of deformation of thin-wall surface parts during milling machining process WANG Ling-yun(王凌云)1... cutting force, the tool temperature, and the tool stress were obtained, and the calculation of the elastic deformation of the thin-walled blade of the free-form surface at the contact points between......
Effect of Cr on Microstructure and Fracture Toughness of Nb-20Ti-16Si-xCr Alloys () 摘要:The present paper reported the phase stability and microstructures evolution of Nb-20Ti-16Si-xCr (x = 0~20at... than 5% in Nb-20Ti-16Si-xCr alloys could result in the formation of Cr-rich Laves phase. In addition, the influence of Cr addition on the room temperature fracture toughness of the alloys after......
in Taylor test and three different fracture modes, the confined fracture inside the cylinder, the shear cracking on the lateral surface and the petalling, were obtained numerically. In this work, we... fracture surface and Fig.3(d) reveals that more than one parallel cracks can be observed on the head lateral surface of the projectile in this stage. As we further increase the impact velocity to larger......
system and Split Hopkinson Pressure Bar. The dynamic behavior (strain rate 6×102?1×104 s?1) of AZ91 was studied. The fracture surface of samples at different strain rates was examined by scanning electron... strain rate range (10?3?10?1 s?1). When the strain rate exceeds 7×103 s?1, the cast AZ91 shows strong strain rate sensitivity. And the microstructure of the sample’s fracture surface exits great......
ANALYSIS ON MECHANISM OF FRACTURE FOR THE SURFACE-HARDENING STEEL章桥新,张东明,黄孝友摘 要:<正>The tensile characteristic of nitrocarburized45 steel treated by different cooling rates was studied in thiswork.We had observed a new kind zigzig tensile curve and itshowed that the tensile curve and the characterastics of thefailure surface related to the cooling......