Powder metallurgy a potential green manufacturing processes: a review

Manufacturing design traditionally approached as techno-economic aspect, but the emerging awareness created by UN-world commission on environment and development (WCED) from the early 1990’s, and the alarm of climatic and environmental issues has picked up to change the traditional design way to techno-economic-sustainable approach. This, in short, can be stated as a green manufacturing technology; the major challenge lying in inculcating the sustainable aspect into traditional manufacturing design is cost despite seeing many advantages such as waste reduction, energy consumption reduction, recycling and so on. Unless, there is a technology that proves to have an economic viable as well as technically sustainable the developing countries would hardly take-up initiation to move from traditional approach, otherwise a legislative compulsion calls for. The powder metallurgy is one of such promising non-traditional manufacturing process that possesses high potential for green manufacturing. The green manufacturing is not just about quality or environment or energy or recycling, but it’s a combination of all for the betterment of companies, employees, stakeholders and customers. The present state of art powder metallurgy process caters the need of green technological requirement, which is being reviewed in this article comprehensively

Densification and workability study on non - linear deformation of aluminium composite during hot swaging

Upsetting exercise usually carried out to investigate metal flow characteristics. The composite produced in the present investigation is through powder metallurgy processing, thus in addition to the metal flow characteristics which are studied in the form of workability, also undergoes densification changes. Hence, both densification and workability characteristics are the objective of study on the chosen aluminium matrix composites. The aluminium composites are having inheritance advantage especially the high specific strength and so its potential applications in various field, which drives to pay attention in the present investigation. Since the upsetting exercise is carried out, it is envisaged the bulging at the free deformation surface; is an indication of non-linear deformation. So, apart from revealing the aforementioned characteristics comprehensively under bulging it is also subjected to statistical treatment to reveal its true influence on the characteristics under given process conditions

Modelling the mechanical strengthening parameter of sintered Fe-0.8%C preforms under cold upsetting

Powder metallurgy (PM) is one of the net shape or near net shape processes, which simply means almost all the initial material is converted into final product. However, to produce product with high strength is a main challenge due to readily available porosities, which are highly governed by several process parameters. An optimised methodology is necessary for PM experiments. In conventional means it is such a tedious, costlier and time consuming, thus design of experiments (DoE) principles have been used to model the mechanical strengthening parameters of sintered Fe-0.8%C preforms during cold upsetting operations. The process parameters such as aspect ratios and frictional conditions are varied by keeping initial density as constant. The resulting model shows that the parameters are not significantly influencing the strength coefficient, which is otherwise for strain hardening exponent