Effect of Deformation Rate on the Elastic-Plastic Deformation Behavior of GH3625 Alloy

Detail characterization on the microstructure evolution of nickel-base alloy 600MA via surface mechanical attrition treatment

Chapter 5 - The Mobility and Migration of Boundaries

The effect of neighboring grain orientation on dislocation-grain interaction in Ti-5553 alloy

Physical mechanisms of nanocrystallization of a novel Ni-based alloy under uniaxial compression at cryogenic temperature

通过高Nb、V或Ti(~0.1%),低Mo(≤0.2%)微合金化设计,在经TMCP工艺后用恒载荷拉伸实验测定了Fe-C-M-Mo(M=Nb、V或Ti)系合金钢的失效温度。用EBSD分析了TMCP后样品中的界面密度,用TEM观测了恒载拉伸实验后样品中的纳米析出相。结果表明:在Fe-C-V/Nb钢中添加约0.2%Mo使其在280 MPa恒载荷拉伸升温过程中的失效温度提高约40℃。小角度界面为MC型析出相形核析出提供了有利位置,加速了MC相的析出,在升温过程中细小弥散的MC相在小角度界面形核析出起到了良好的高温沉淀强化作用,提高了耐火钢的失效温度。含Mo的Ti-Mo钢具有较高的小角度界面密度,导致其中MC型析出相析出较快,因此具有最高的失效温度,Nb-Mo钢次之,V-Mo钢因小角度界面密度最小使其在高温下MC相析出的动力学减缓,因此失效温度最低。

Hot deformation characteristics and mechanism understanding of Ti–6Al–2Sn–4Zr–6Mo titanium alloy

Dislocation-type evolution in quasi-statically compressed polycrystalline nickel

Influence of SiC grain boundary character on fission product transport in irradiated TRISO fuel

Atomistic simulations of Bauschinger effects of metals with high angle and low angle grain boundaries

EBIC AND DLTS MEASUREMENTS OF SI-AND POLYCRYSTALLINE SILICON

Conventional quenching and tempering were employed to achieve the optimal strength and toughness of low-carbon low-alloy steel. The fracture behavior (crack initiation and propagation) of the steel in the impact process was also analyzed. It was found that the microstructures of the steel after different tempering treatments were mainly composed of martensite, and its mechanical properties were dependent on the tempering temperature. With the increase in tempering temperature, martensitic laths merged and coarsened. Moreover, recovery occurred, causing a decrease in dislocation density. Subsequently, the strength of the steel gradually decreased, and the impact energy increased. When the tempering temperature was 600 °C, the optimal yield strength (557 MPa) and the impact energy (331 J) were achieved. In addition, high angle grain boundaries (HAGBs) affected the impact energy and crack propagation. Cracks were easily deflected when they encountered high angle grain boundaries, and linearly expanded when they encountered low angle grain boundaries (LAGBs).

Effect of deformation rate on interfacial heat transfer coefficient in the superalloy GH4169 hot forging process

Radiation induced grain boundary segregation in ferritic/martensitic steels

1. The thermal stability of the dynamically (during deformation) and statically (in the interdeformation pauses) formed structures may be judged from the parameters of the hot deformation curves (σy, ɛmax, τmax) in repeated loading with a change in deformation rate. 2. The alloy austenite of 110Kh6 steel is resistant to softening in the post-deformation hold. In it the processes of static recovery occur partially but not static recrystallization. 3. The degree of increase in the deforming stress at the initial moment of increase in deformation rate depends upon the structure created at this moment. The lower the temperature of hot deformation, the greater the increase in stress (with the same degree of deformation) with an increase in the deformation rate. With a reduction in temperature the greater the deformation rate the greater the degree to which the flow stress changes. In multipass rolling without a decrease in the degree of deformation in each pass the degree of increase in the required stress is determined, in addition, by the reduction in temperature and the increase in deformation rate with an increase in the number of passes. 4. The parameters of the substructure and the level of flow stress in the steady stage do not depend upon the original structural condition and the preliminary deformation but are determined by the rate and temperature of final deformation.

Study on the micro-structure and the nano-indentation responses of laser solid formed epitaxial Ni-based superalloy