a b s t r a c t
This paper reviews the recent developments in material property modelling and its applications in processing simulation. Many material properties needed by process simulation can now be readily provided, such as the solidification properties and high temperature stress–strain curves. The solidification properties are affected by changes in composition within the specification range of an alloy; such changes in properties then affect casting simulation results. The mechanical properties are calculated by considering two competing deformation mechanisms (dominated by either dislocation glide or dislocation climb), with automatic selection of the dominant mechanism.Sample calculations are given for a variety of engineering alloys, including steels, aluminum, titanium, and nickel-based superalloys. The material properties data calculated can now be passed directly into commercial computer-aided engineering packages for casting and deformation simulation.
1. Introduction
Material data is a vital input for computer-aided engineering (CAE) process simulation packages based on finite-element or finite-difference (FE/FD) analysis. Such data include physical, thermo-physical and mechanical properties, all as a function of temperature. Traditionally such data are gathered from experimentation, which has significant disadvantages in that not all of the required data are readily available and, in particular, measurement of high temperature properties is not only expensive but also time-consuming. It is therefore of no surprise that lack of material data has been a common problem for all FE/FD simulation packages. To overcome this problem and provide reliable and cost effective data for process simulation, computer-based models are required so that such properties can be readily calculated. A schematic diagram of the approach for processing modelling is shown in Fig. 1.
The present paper demonstrates the capabilities of computer software JMatPro [1] that is able to calculate the material data required in process simulation, which otherwise has to be measured through experiments such as dilatometry and Gleeble® testing. While detailed information on the development and validation of relevant models can be referred to Refs. [2–7], this paper is focused on the application aspects of the material data
calculated, concentrating on two areas. One is the calculation of physical and thermo-physical properties critical to casting simulation.The other is the calculation of high temperature strength and stress–strain curves which are critical to deformation simulation.
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