Fast differential scanning calorimetry to mimic additive manufacturing processing: specific heat capacity analysis of aluminium alloys

Abstract

Eutectic AlSi12, commonly used in casting and in additive manufacturing, is investigated with Fast Differential Scanning Calorimetry to determine the impact of different cooling rates from the liquid state upon the apparent specific heat capacity on subsequent heating. A heat flow correction strategy is developed and refined for the reliable and precise measurement of sample heat flow using chip sensors and assessed by the evaluation of results on pure (99.999%) aluminium. That strategy is then applied to the study of the AlSi12 eutectic alloy, and rate-dependent perturbations in the measured apparent specific heat capacity are discussed in terms of Si supersaturation and precipitation. Several cooling rates were implemented from − 100 to − 30,000 K s−1, and subsequent heating ranged from + 1000 to + 30,000 K s−1. After rapid cooling, a drop in AlSi12 apparent specific heat capacity is found on heating above ~ 400 °C; even at rates of + 10,000 K s−1, a result which has high relevance in metal additive manufacturing where similarly fast temperature cycles are involved. The Literature data, temperature modulated DSC and CALPHAD simulations on the heat capacity of AlSi12 are used to provide comparative context to the results from Fast Differential Scanning Calorimetry.

Capacity Strategies a Comparative Perspective in Manufacturing vs Service Industries

“…Organisasi dari berbagai area industri perlu mempertimbangkan strategi kapasitas yang akan digunakan agar dapat memenuhi keinginan konsumen dan dapat menjalankan operasional dengan efisien [4]. Seperti contohnya perusahaan berbasis Usaha Kecil dan Menengah (UKM), harus mempunyai strategi bisnis yang strategi operasi yang tepat dan efisien dalam menjalankan proses bisnisnya agar tidak melenceng dan dapat berjalan sesuai tujuan dari perusahaan [5]. Strategi yang dapat digunakan ialah dapat dimulaikan dengan pengembangan produk berdasarkan konsep yang inovatif dan memiliki keunikan sehingga dapat menciptakan keunggulan dan karakteristik yang dapat membedakan produk tersebut dari para pesaing, serta meliputi proses internal perusahaan dan pendekatan pemasaran dari produk tersebut [6].…”

Monitoring of Laser-Induced Fast Recrystallization in Ss-316l Through Synchrotron X-Ray Diffraction

“…Fast Differential Scanning Calorimetry (FDSC) can nowadays be used to mimic very fast heating and cooling rates, but the temperatures remain limited to 1000 • C (at most), and the technique can only be applied to very small samples (approx. size of 50 µm) [16]. In a recent study done at the European Synchrotron Radiation Facility (ESRF) by Yildirim et al on a Fe-Si-Sn steel [17], the combination of Dark-field Xray Microscopy (DFXM), EBSD measurements, and synchrotron XRD, allowed the authors to track a grain from the highly deformed state through consecutive annealing steps, during which they could observe the formation of new nuclei and disoriented cells.…”