Fracture mechanism of nano- and submicron-SiCp/Mg composite during room temperature tensile test: Interaction between double sized particles and dislocations

2019 ◽  
Vol 791 ◽  
pp. 452-460 ◽  
Author(s):  
Mingjie Shen ◽  
Junhong Jia ◽  
Tao Ying ◽  
Nairu He
Keyword(s):  
Tensile Test ◽  
Fracture Mechanism ◽  
Room Temperature ◽  
Room Temperature Tensile Test

Microstructure and Mechanical Properties of As-Cast and As-Extruded Mg-Gd-Er-Zn-Zr Alloy

2015 ◽  
Vol 1088 ◽  
pp. 221-226 ◽  
Author(s):  
Kai Wen ◽  
Wen Bo Du ◽  
Ke Liu ◽  
Zhao Hui Wang ◽  
Shu Bo Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Room Temperature ◽  
Cast Alloy ◽  
Extrusion Direction ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Microstructure And Mechanical Properties ◽  
Room Temperature Tensile Test ◽  
Zr Alloy

The Microstructure and mechanical properties of as-cast and as-extruded Mg-12Gd-2Er-1Zn-0.6Zr alloy are investigated in the present paper. The microstructure is analyzed by OM, SEM and TEM with SAED, and the mechanical properties are valued by the room temperature tensile test. The result shows that the coarse Mg5(Gd, Er, Zn) phase in the as-cast alloy was broken during hot extrusion process, and it was distributed at the grain boundary along the extrusion direction. The enhancement in mechanical properties of the extruded alloy is mainly ascribed to the refinement of these grains. The sizes of dynamical recrystallized grains are homogeneously, which was about 7 μm. Stacking fault existed in the as-cast alloy, which has a little effect on the dynamic recrystallization because of its tiny thicknesses.

Effect of Cobalt Addition on the Deformation and Recrystallization Textures of Polycrystalline IN713C Nickel Based Superalloy

2014 ◽  
Vol 922 ◽  
pp. 711-715 ◽  
Author(s):  
J.Y. Song ◽  
Shigeo Sato ◽  
Yuichiro Koizumi ◽  
Akihiko Chiba
Keyword(s):  
Tensile Test ◽  
Room Temperature ◽  
Nucleation Site ◽  
Nickel Base Superalloy ◽  
Recrystallization Behavior ◽  
Nickel Based Superalloy ◽  
Nickel Base ◽  
Inconel 713C ◽  
Cobalt Addition ◽  
Room Temperature Tensile Test

The aim of this study was to examine the effect of cobalt addition on the deformation and recrystallization behavior. The prepared material was Inconel 713C nickel base superalloy. In order to improve the deformability, the IN713C was modified by cobalt addition with 5 and 10wt%. Mechanical property was determined by room temperature tensile test with the strain rate of 10-3s-1.The recrystallization was performed at 1473K for 300sec followed by oil quenching. The final microstructure becomes homogeneous through cobalt addition. Strength and work hardening rate were decreased during room temperature tensile test. By contrast, elongation was increased. Nucleation site was changed by cobalt addition. It was found that kinetics of recrystallization is dependent of the cobalt addition. The cobalt addition is attributed with ductility and recrystallization behavior and the latter is related to change of deformation behavior.

Microstructural Evolution and Fracture Mechanism for Scar Defect Formation on Advanced High Strength Steel during a Shearing Process

2020 ◽  
pp. 1-22
Author(s):  
Onnjira Diewwanit ◽  
Paranee Keawcha-um ◽  
Thanita Keawcha-um ◽  
Weesuda Petchhan ◽  
Sutasn Thipprakmas
Keyword(s):  
Stress Distribution ◽  
Tensile Test ◽  
Fracture Mechanism ◽  
Defect Formation ◽  
Flow Direction ◽  
High Strength ◽  
Distribution Analysis ◽  
Dp Steel ◽  
Tensile Test Specimen ◽  
Cut Edge

Abstract To form a required shape of the advanced high strength steels especially DP steel sheets, shearing process being one of major processes is commonly used. In general, although the good cut-edge with small fracture could be achieved by setting small shearing clearance, the tearing being a major defect commonly occurred on the cut-edge. Therefore, in the present research, a tearing mechanism on the DP steel sheet, grade SPFC980Y (JIS) during shearing process is investigated and clearly clarified based on the microstructure evolution, fracture mechanism, and stress distribution analysis. The microstructure evolutions on both tensile test specimen and sheared workpiece were performed to clarify the fracture mechanism. The angle between shear band and elongated grain flow direction is examined based on tensile test and it is used to predict an angle of initial fracture and its propagation on the shearing process as well. By associated with stress distribution analysis generated in shearing zone during shearing phase, the results revealed that the fracture propagated out of shearing zone and the fracture could be easily delayed. This resulted in that the tearing could be generated in the case of SPFC980Y. Vice versa, the fracture propagation is all in shearing zone, the fracture could not be delayed and the fracture completely generated on the cut-edge in the case of SPCC. In the present resents, the tearing mechanism on the DP steels in shearing process is clearly characterized.

Atomic simulation of mechanical properties of irradiated iron

2019 ◽  
Vol 31 (02) ◽  
pp. 2050027
Author(s):  
Lei Ma ◽  
Changsheng Li ◽  
Ailong Zhang ◽  
Wangyu Hu
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Tensile Test ◽  
Room Temperature ◽  
Stacking Faults ◽  
Dynamics Simulation ◽  
Stress And Strain ◽  
Micro Structure ◽  
Atomic Simulation

The mechanical properties of irradiated iron are studied by molecular dynamics simulation. The initial models are irradiated with the energy of primary knocked-on atoms (PKA) of 10[Formula: see text]keV at 100, 300, 500 and 600 K, and then all the irradiated models are subjected to tensile test. The results reveal that the mechanical properties of irradiated iron are changed compared with un-irradiated iron, the yield stress and strain decrease after irradiation, and the irradiation causes the hardening of micro-structure at low temperature and high temperature, but it results in the softening of structure at room temperature. The plastic reduces for irradiated iron under tensile test, more stacking faults are formed in the crystal structure as the temperature increases.

Study on Elevated Temperature Impact Properties of 20MnSiV Steel

2012 ◽  
Vol 602-604 ◽  
pp. 313-317
Author(s):  
Da Yong You ◽  
Yin Lan Bai
Keyword(s):  
Elevated Temperature ◽  
Test Temperature ◽  
Fracture Mechanism ◽  
Room Temperature ◽  
Strain Softening ◽  
Practical Significance ◽  
Stress Strain ◽  
Strain Fracture ◽  
Temperature Impact ◽  
Longitudinal Extension

The test of 20MnSiV Ⅲ grade reinforced bar is carried out at room temperature and other nine temperatures: 100°C、200°C、300°C、400°C、500°C、600°C、700°C、800°C、900°C.The results show that, the highest impact absorbing energy 137J appeared when the test temperature is 200°C, while the lowest is 75.5J when the temperature is 600°C. While the test temperature is over 700°C and the sample is near damaged, strain softening and serious longitudinal extension is happened in the course of impact, and the gap of the sample can not result in the concentration of stress-strain, fracture mechanism of the material is changed, and then impact absorbing energy had no practical significance.

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