Development of High Performance Cast Iron with Combination of Improved Mechanical and Thermal Properties Through Mo Addi
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cast iron (GCI) is widely used in industrial applications due to its application flexibility, good castability, low-cost, and wide range of achievable mechanical properties. High strength and good heat transport are important for many casting components, e.g., brake discs and flywheels, where the heat has to dissipate quickly and the temperatures should be kept low to sustain dimensional stability and reduce internal stresses. Thus, it is necessary to develop high
XIANFEI DING and HONG HUANG are with the Beijing Institute of Aeronautical Materials, Beijing 100095, China and also with the National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China. Contact e-mail: [email protected] WARKENTIN MATTHIAS is with the Ford Research sterfeldstr. 200, 52072 Aachen, Germany. SHIYAO HUANG is with Materials and Process Research, Ford Motor Research and Engineering Center, Nanjing 211100, China. YONGHAO LU is with the National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China. QIANG FENG is with the State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China and also with the Beijing Key Laboratory of Special Melting and Preparation of High-End Metal, University of Science and Technology Beijing, Beijing 100083, China. Manuscript submitted November 14, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
performance cast iron (HPCI) with improved mechanical properties while maintaining high thermal conductivity for specific engineering applications. Previous studies showed that the thermal conductivity and mechanical properties are usually contradictory to each other in GCI. The principal means of improving the mechanical properties are to decrease the percentage of graphite as well as to reduce its size.[1,2] However, the thermal conductivity is favored by the graphite amount or size increase and the graphite morphology consisting of extended lamellae in a three-dimensional interconnected network.[3,4] Among all the GCIs, the pearlitic matrix GCI, consisting of pearlite and randomly orientated Type A lamellar graphite, can be characterized by considerable strength and better thermal conductivity.[5,6] It was reported that the high strength is related to the large primary austenite dendrites and the small eutectic cell (EC) size, while the good thermal conductivity is obtained by the uniformly distributed graphite flakes in the pearlitic GCI.[7,8] However, limited attention has been paid to simultaneously improve both the thermal conductivity and mechanical properties. Mo-alloying has been reported to improve either the mechanical properties or thermal conductivity in GCIs, which may be a solution to develop HPCI. Mo addition was generally used to reduce the graphite content and strongly refine the graphite as well as the pearlite, to improve the strength.[5,9,10] Low content and refining of the graphite can lower the graphite flakes as the crack nucleation sites
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