Effect Of Cryorolling Research Articles

Effect of Cryorolling on Strengthening–Softening Transition in Deformation Twinned Cupronickel Alloy

Effect of Cryorolling on Strengthening–Softening Transition in Deformation Twinned Cupronickel Alloy

Effect of Cryorolling and Aging Treatment on Erichsen Formability of AA7075 Sheets at Room and Cryogenic Temperatures

Effect of Cryorolling and Aging Treatment on Erichsen Formability of AA7075 Sheets at Room and Cryogenic Temperatures

Effect of Cryorolling on Microstructure, Conductivities, and Mechanical Properties of a Cast Near-Eutectic Al-Si-Fe-Mg Alloy

Effect of Cryorolling on Microstructure, Conductivities, and Mechanical Properties of a Cast Near-Eutectic Al-Si-Fe-Mg Alloy

Effect of Cryorolling After Pre-aging on Tensile Properties and Microstructures of AA7075 Plates

Effect of Cryorolling After Pre-aging on Tensile Properties and Microstructures of AA7075 Plates

Effect of cryorolling and ageing on the microstructure and mechanical properties of Al 7085 alloy

Cryorolling (CR) can effectively avoid room temperature rolling cracking of high-strength aluminum alloy. In this work, solution-treated bulk Al 7085 alloy samples were subjected to CR and room temperature rolling (RTR), respectively. When the deformation was 70%, the RTR sample was broken, while the CR one still had no cracks when the deformation was up to 90%. Consequently, the microstructure and mechanical properties of the CR samples before and after ageing treatment were investigated. The results show that after the solution-treated bulk Al 7085 alloy samples were cryorolled, the yield strength (YS) and the ultimate tensile strength (UTS) were increased by 74% and 31%, respectively. However, the elongation to failure (EtF) was decreased. After the subsequent 100 °C/20 h peak ageing (PA) treatment, the YS and UTS can be further increased by 14% and 10%, respectively, and the EtF was increased by 39% compared with that of the CR samples. After PA treatment, nanosized GP zones and η′ precipitates were precipitated. Precipitation strengthening is the main contributor to the strength enhancement of CR samples after PA treatment, which can not only compensate for the reduction caused by the decrease in dislocation density but also improve the strength of the material.

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

The Effect of Cryorolling on the Microstructure of Al-Cu-Mg Alloy

A precipitation hardenable Al-Cu-Mg alloy was cryorolled with liquid nitrogen followed solution treatment and then aged at 170 ̊C for different time. The microstructure was characterized by optical microscopy (OM) and transmission electron microscopy (TEM). Hardness and tensile strength were also tested. The dislocation loops in the cryorolled alloy are more than the room temperature rolled alloy. Meanwhile the hardness, yield strength and tensile strength are larger than the room temperature rolled alloy.

Effect of Cryorolling and Aging on Fatigue Behavior of Ultrafine-grained Al6061

The effects of cryorolling (rolling at liquid nitrogen temperature) and heat treatment on tensile and high-cycle fatigue properties and fatigue crack growth rate of Al6061 alloy have been investigated in the present work. First, the solid solution-treated bulk Al6061 alloy was subjected to cryorolling with 90% total thickness reduction and subsequent short annealing at 205°C for 5 min and peak aging at 148°C for 39 h to achieve grain refinement and simultaneous improvement of the strength and ductility. Then, hardness measurements, tensile tests, fatigue life, and fatigue crack growth rate tests including fractography analyses using scanning electron microscopy were performed on bulk Al6061 alloy, cryorolled (CR), and cryorolled material followed by peak aging (PA). The PA specimen showed improved yield strength by 24%, ultimate tensile strength by 20%, and ductility by 12% as compared with the bulk Al6061 alloy. It is shown that the fatigue strength of both CR and PA specimens under a high-cycle fatigue regime are larger than that of the bulk Al6061 alloy. Also, fatigue crack growth rates of the CR and PA specimens show significant enhancement in fatigue crack growth resistances as compared with the bulk Al6061 alloy, as a result of grain refinement.

Effect of cryorolling and annealing on recovery, recrystallisation, grain growth and their influence on mechanical and corrosion behaviour of 6082 Al alloy

In the present study, recovery, recrystallisation, grain growth, mechanical, and corrosion resistance of 6082 Al alloy subjected to cryorolling (CR) and annealing (AN) treatment were investigated. CR was performed to produce ultrafine grained structure and subsequently, AN treatment was given to investigate its influence on recovery, recrystallisation, and grain growth. The recovery and recrystallisation occurs between 110 and 250 °C and 250–300 °C respectively, where as grain growth starts from 300 °C due to insoluble dispersions (AlMn & AlMnSi) and Mg2Si precipitates in the alloy as evident from Differential scanning calorimetry (DSC), Electron back scattered diffraction (EBSD), hardness and Transmission electron microscopy (TEM) results. CR 6082 Al alloy has showed increased hardness of 120 VHN and ultimate tensile strength of 353 MPa. Annealing of CR 6082 Al alloy at 150 °C exhibited maximum hardness, ultimate tensile strength (UTS) and ductility of 127 VHN, 362.5 MPa, and 11%, respectively. CR of the 6082 Al alloy has produced high density of dislocation and increase in grain boundary area, which enabled the formation of dense oxide film on surface, enhancing its corrosion resistance. CR samples annealed at 350 °C shows excellent corrosion resistance as compared to as deformed Al alloy.

Evolution and interaction of twins, dislocations and stacking faults in rolled α-brass during nanostructuring at sub-zero temperature

The effect of cryorolling (CR) strain at 153 K on the evolution of structural defects and their interaction in α−brass (Cu–30 wt.% Zn) during nanostructuring has been evaluated. Even though the lattice strain increases up to 2.1 × 10−3 at CR strain of 0.6 initially, but it remains constant upon further rolling. Whereas, the twin density (β) increases to a maximum value of 5.9 × 10−3 at a CR strain of 0.7 and reduces to 1.1 × 10−5 at 0.95. Accumulation of stacking faults (SFs) and lattice disorder at the twin boundaries causes dynamic recrystallization, promotes grain refinement and decreases the twin density by forming subgrains. Detailed investigations on the formation and interaction of defects have been done through resistivity, positron lifetime and Doppler broadening measurements in order to understand the micro-mechanism of nanostructuring at sub-zero temperatures.

Experimental evaluation of mechanical properties and fracture-fatigue simulation of cryo- and room-temperature-rolled zircaloy-2

In this study, the mechanical properties of mercury–quenched, cryorolled (CR) and room–temperature–rolled (RTR) zircaloy–2 have been examined by performing the tensile and hardness tests. The effect of cryorolling and room temperature rolling on the fracture properties has been evaluated by performing two–dimensional (2D) quasi–static crack growth simulations using finite element approach under plane stress condition. J–integral and internal energy of the mercury–quenched, CR and RTR zircalloy–2 are evaluated and compared with each other. The S–N curves for mercury–quenched, CR and RTR zircaloy–2 are obtained through finite element simulations. After performing the fracture and fatigue simulations, it is found that 85% cryorolled zircaloy–2 possesses better fracture and fatigue behaviour when compared with mercury–quenched and 85% RTR zircaloy–2.