The alteration of dislocation arrays in the process of strain hardening for normalized carbon steel 1035 was investigated by transmission electron microscopy. At primary stage the separated dislocation lines tend to ...The alteration of dislocation arrays in the process of strain hardening for normalized carbon steel 1035 was investigated by transmission electron microscopy. At primary stage the separated dislocation lines tend to form tangles and networks, dislocation cells appear at the secondary stage, the amount of the cells increases significantly, its average dimension does not change and the cell walls become clear. The third stage of strain hardening was observed in the process from necking to fracture and shows a straight line segment on the lg σ -lg ε curve, at this time the dislocation cells become smaller and tend to form band structure.展开更多
The relationships between fatigue threshold △Kth and the initial yield .strength σ0 of normalized 1035 steel after various prestrain (at fist, second and third hardening stages respectively) were investigated throug...The relationships between fatigue threshold △Kth and the initial yield .strength σ0 of normalized 1035 steel after various prestrain (at fist, second and third hardening stages respectively) were investigated through the analysis of theσ-εcurves and transmission electron microscope (TEM). After prestraining at first or second hardening stage, there is a marked drop in the values of △Kth and σ0. This is in correspondence with the depinning of the solute atoms from the dislocation lines in the Cottrell atmosphere.At the third hardening stage of prestrain the fatigue threshold increases rapidly and △Kth is even 1.6 times as large as the original value. This is because at this stage no dislocation-cell free areas can be found and the refinement of the dislocation cells occurs with the increase in the prestrain level.展开更多
How many roads must a man walk down Before they call him a man And how many times Must the cannonballs fly Before they’re ever banned? How many years Must a mountain exist Before it is washed to the sea? The answer,m...How many roads must a man walk down Before they call him a man And how many times Must the cannonballs fly Before they’re ever banned? How many years Must a mountain exist Before it is washed to the sea? The answer,my friend Is blowin’ in the wind The answer is blowin’ in the wind一个GE还要做什么才能被称为"通用"?我的朋友答案在风中飘摇2007年P&E,通用电气发布了多款数码相机。随即,2007年底GE推出中端消费数码相机E1035。展开更多
文摘The alteration of dislocation arrays in the process of strain hardening for normalized carbon steel 1035 was investigated by transmission electron microscopy. At primary stage the separated dislocation lines tend to form tangles and networks, dislocation cells appear at the secondary stage, the amount of the cells increases significantly, its average dimension does not change and the cell walls become clear. The third stage of strain hardening was observed in the process from necking to fracture and shows a straight line segment on the lg σ -lg ε curve, at this time the dislocation cells become smaller and tend to form band structure.
文摘The relationships between fatigue threshold △Kth and the initial yield .strength σ0 of normalized 1035 steel after various prestrain (at fist, second and third hardening stages respectively) were investigated through the analysis of theσ-εcurves and transmission electron microscope (TEM). After prestraining at first or second hardening stage, there is a marked drop in the values of △Kth and σ0. This is in correspondence with the depinning of the solute atoms from the dislocation lines in the Cottrell atmosphere.At the third hardening stage of prestrain the fatigue threshold increases rapidly and △Kth is even 1.6 times as large as the original value. This is because at this stage no dislocation-cell free areas can be found and the refinement of the dislocation cells occurs with the increase in the prestrain level.
文摘How many roads must a man walk down Before they call him a man And how many times Must the cannonballs fly Before they’re ever banned? How many years Must a mountain exist Before it is washed to the sea? The answer,my friend Is blowin’ in the wind The answer is blowin’ in the wind一个GE还要做什么才能被称为"通用"?我的朋友答案在风中飘摇2007年P&E,通用电气发布了多款数码相机。随即,2007年底GE推出中端消费数码相机E1035。
