General Poster Session: Materials Processing
Program Organizers: TMS Administration
Tuesday 5:30 PM
February 25, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
Cancelled
M-83: Influence of Al2O3 on the Liquid Phase Fluidity and the Consolidation Strength of Sintered Body Formed by Iron Ore Fines: Heping Li1; Zhibin Hong1; Shengli Wu1; Heng Zhou1; Mingyin Kou1; 1University of Science and Technology Beijing
Sinter process plays a very important role in steel companies. With the exploration of iron ores, the Al2O3 content is becoming higher, which affects the liquid phase fluidity and further the consolidation strength of sintered body. However, there exist opposite conclusions for the influence of Al2O3 on the above characteristics. Therefore, it is imperative to study the influence of Al2O3. The influence of Al2O3 content on the liquid phase fluidity and further the consolidation strength was studied in the present work. The results revealed that the liquid phase fluidity and the consolidation strength decreased with the increase of Al2O3 content. The liquid phase fluidity was in a quadratic function relationship with the consolidation strength of the sintered body. The optimal Al2O3 content was about 2wt% in Meishan Iron and Steel company.
M-84: Material Surface Metallurgy By Double-glow-discharge Plasma Technology --- Xu-Tec Process: Zhong Xu1; Frank Xiong2; 1Taiyuan University of Technology; 2Heaptech
Plasma Surface Metallurgy is newly emerging advanced field in materials science and engineering. From the plasma nitriding for metal surface treatment developed in 1930s, to the plasma surface alloying for metal surface metallurgical modification with double glow discharge plasma process (Xu-tec process) been developing since 1980s, the plasma surface metallurgy has been well established to meet industrial demand for proper surface modification (surface metallurgy) for its physical, chemical, or mechanical property changes required for many specific applications. Industrial applications of this technology have generated huge economic profits and social benefits with environment-friendly and resource-saving. This presentation is to introduce our engineering work and in-depth understanding on Plasma Surface Metallurgy by the double glow plasma surface alloying technology. Several application examples will be shown, such as surface alloying on iron and steel, Titanium and alloys, and intermetallic compounds, for enhancing surface properties of wear-, corrosion- and flame- resistance.
M-85: Microstructural and Mechanical Properties of Pinch Rolls Fabricated by Horizontal Centrifugal Casting: Kyeongsoon Park1; G.W. Jung1; H.Y. Hong1; D.H. Kim1; N.K. Yi2; C.K. Kim2; 1Sejong University; 2S.M Metal
Pinch-rolls are utilized to guide the hot-rolled strips to the coiler mandrel. The outer surface of the pinch rolls is very wear-resistant. In this work, we fabricated the pinch rolls by a horizontal centrifugal casting and studied their microstructural and mechanical properties. Molten Fe-Ni-Cr-Mo-X alloy steels were directly poured into a mold that rotated about horizontal axis. The molten alloy steels were spread on the inside mold wall and solidified after cooling. The microstructure, tensile strength, wear resistance, and micro-hardness were investigated. We found a slight change in microstructure and micro-hardness at the mixed regions of outer and inner layers along the thickness direction. The fracture surfaces of tensile tested samples were also investigated to identify the fracture characteristics, showing a mixed transgranular and intergranular mode. The structural and mechanical properties of the pinch rolls were optimized by controlling chemical composition and centrifugal casting and heat treatment processes.
M-86: Simulation of Microstructure Evolution during Magnetic Field Assisted Manufacturing: Omar Betancourt1; Mahmood Mamivand1; 1Boise State University
Magnetic field thermal processing has shown to alter materials microstructure and consequently properties. In particular, thermomagnetic treatment is a technique to tailor materials microstructure in order to develop permanent magnets. In this work, we developed a simulation framework for ternary alloys microstructural evolution during magnetic heat treatment. We coupled the phase field model with micromagnetic theories to capture the temporal and spatial evolution of the microstructure. We parameterized the model for Fe-Cr-Co with parameters from CALPHAD databases in order to make the simulation close to the realistic alloy. We used the Idaho National Laboratory finite element package MOOSE, Multi-physics Object Oriented Simulation Environment, to simulate the manufacturing process, including thermomagnetic treatment along with spinodal decomposition. The results show a validated model that represents a reasonably accurate quantitative depiction of the Fe-Cr-Co alloy magnet, including visualization of components and the minimization of the microstructure’s free energy density throughout simulated time.