Shape-Memory Materials

The hot compressive deformation behaviors of a typical Ni-based superalloy are investigated over wide ranges of forming temperature and strain rate. Based on the experimental data, the efficiencies of power dissipation and instability parameters are evaluated and processing maps are developed to optimize the hot working processing. The microstructures of the studied Ni-based superalloy are analyzed to correlate with the processing maps. It can be found that the flow stress is sensitive to the forming temperature and strain rate. With the increase of forming temperature or the decrease of strain rate, the flow stress significantly decreases. The changes of instability domains may be related to the adiabatic shear bands and the evolution of δ phase(Ni 3 Nb) during the hot formation. Three optimum hot deformation domains for different forming processes (ingot cogging, conventional die forging and isothermal die forging) are identified, which are validated by the microstructural features and adiabatic shear bands. The optimum window for the ingot cogging processing is identified as the temperature range of 1010–1040 °C and strain rate range of 0.1–1 s −1 . The temperature range of 980–1040 °C and strain rate range of 0.01–0.1 s −1 can be selected for the conventional die forging. Additionally, the optimum hot working domain for the isothermal die forging is 1010–1040 °C and near/below 0.001 s −1 .

Hot deformation behavior and processing map of a typical Ni-based superalloy

A physically-based constitutive model for a typical nickel-based superalloy

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Metal Cutting Principles

Prediction of surface roughness in hard turning under high pressure coolant using Artificial Neural Network

In this work, an attempt is made to reduce the detrimental effects that occurred during machining of Ti–6Al–4V by employing surface textures on the rake faces of the cutting tools. Numerical simulation of machining of Ti–6Al–4V alloy with surface textured tools was employed, taking the work piece as elasto-plastic material and the tool as rigid body. Deform 3D software with updated Lagrangian formulation was used for numerical simulation of machining process. Coupled thermo-mechanical analysis was carried out using Johnson-cook material model to predict the temperature distribution, machining forces, tool wear and chip morphology during machining. Turning experiments on Ti–6Al–4V alloy were carried out using surface textured tungsten carbide tools with micro-scaled grooves in preferred orientation such as, parallel, perpendicular and cross pattern to that of chip flow. A mixture of molybdenum disulfide with SAE 40 oil (80:20) was used as semi-solid lubricant during machining process. Temperature distribution at tool–chip interface was measured using an infrared thermal imager camera. Feed, thrust and cutting forces were measured by a three component-dynamometer. Tool wear and chip morphology were captured and analyzed using optical microscopic images. Experimental results such as cutting temperature, machining forces and chip morphology were used for validating numerical simulation results. Cutting tools with surface textures produced in a direction perpendicular to that of chip flow exhibit a larger reduction in cutting force, temperature generation and reduced tool wear.

Effect of micro-textured tools on machining of Ti–6Al–4V alloy: An experimental and numerical approach

Effect of cryogenic cooling on machinability and surface quality of bio-degradable ZK60 Mg alloy

Importance of this present investigation is to identify the influence of modified tool (tool with texturing) on the process of orthogonal turning of Ti–6Al–4V work material. To achieve the enhanced...

Influence of wire-EDM textured conventional tungsten carbide inserts in machining of aerospace materials (Ti–6Al–4V alloy)

The emerging trends in the development of advanced smart materials with better unique properties under different environments for a particular application fascinate the researchers and industrialis...

Machining of NiTi-shape memory alloys-A review

In the present investigation, turning experiments were performed on Ti-6Al-4V alloy with coated (TiN, TiAlN) and uncoated cutting tool inserts with different textured patterns fabricated on the rake surface. Performance of coated and uncoated textured tools were evaluated using machinability and surface characteristic parameters such as cutting forces, micro hardness, surface roughness, chip formation and tool wear. Based on the machinability evaluation, a comparative study was also made to identity the better performing tool while machining of Ti-6Al-4V alloy. Experimental results revealed that TiAlN coated perpendicular textured cutting inserts exhibit better machinability in all aspects when compared with the other type of inserts.

D. Arulkirubakaran

Papers

Effect of micro-textured tools on machining of Ti–6Al–4V alloy: An experimental and numerical approach

Effect of cryogenic cooling on machinability and surface quality of bio-degradable ZK60 Mg alloy

Influence of wire-EDM textured conventional tungsten carbide inserts in machining of aerospace materials (Ti–6Al–4V alloy)

Machining of NiTi-shape memory alloys-A review

Performance of TiN and TiAlN coated micro-grooved tools during machining of Ti-6Al-4V alloy