Abstract
Samples of a model dual-phase system, consisting of copper and AISI-420 martensitic steel have been synthesized using spark plasma sintering, with the objective of developing a microstructural analogue for dual-phase steels, in which the volume fraction and size of each phase can be controlled independently. Microstructural investigation of the samples, including fractography of samples deformed in tension until failure, show that densification is strongly temperature dependent. Samples sintered at temperatures of 900 °C or above at a pressure of 60 MPa show a density of more than 98%. The best mechanical properties, in terms of ultimate tensile strength and ductility is found in samples sintered at a temperature of 1000 °C, where a density of nearly 99% is achieved.
Highlights
There is much interest at present in the relationship between microstructure and mechanical properties in composite metallic systems consisting of hard and soft phases
These materials have been widely explored for use in automotive applications, as they show higher ultimate strength, and higher work hardening rate compared to high-strength low-alloy steels (HLSA), while demonstrating improved formability and ductility compared to their HSLA counterparts [4]
Summary and conclusions Spark plasma sintering has been used to explore the synthesis of a model dual-phase system using powders of copper and AISI-420 martensitic stainless steel
Summary
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