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Consecutive casting of bimetallic applies consecutive sequences of pouring of two materials into a sand mold. The outer ring is made of NiHard1, whereas the inner ring is made of nodular cast iron. To enable a consecutive sequence of pouring, an interface plate made of low carbon steel was inserted into the mold and separated the two cavities. Afte...
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Context 1
... the coefficient of thermal expansion of low carbon steel is higher than those of nodular cast iron, the interface plate achieved higher contraction and this led further to a buildup of pressure at the contact area. Table 2 shows the coefficient of thermal expansion of nodular cast iron, low carbon steel and NiHard1. Contraction and expansion of material can be expressed as follows: ...Context 2
... the coefficient of thermal expansion of low carbon steel is higher than those of nodular cast iron, the interface plate achieved higher contraction and this led further to a buildup of pressure at the contact area. Table 2 shows the coefficient of thermal expansion of nodular cast iron, low carbon steel and NiHard1. Contraction and expansion of material can be expressed as follows: ...Citations
... Hadfield austenitic manganese steel faces other challenges, such as poor machinability due to its mechanical properties and difficulties in the heat treatment process caused by carbide formation [13][14][15]. Several studies have investigated alternative materials to replace Hadfield austenitic manganese steel, including cast iron, austempered ductile iron, low alloy wear-resistant steels, and bimetallic materials [7,16,17]. However, their applications are limited due to the manufacturing process or low toughness. ...
... Tungsten carbide-cobalt (WC-Co)-based materials have high wear resistance and mechanical strength, making them widely used for machining tools such as cutting tools and drill bits [16,[18][19][20]. Several processes have been developed for recycling WC-Co tool tip scraps, including hydrometallurgy [21][22][23][24][25] and an eco-friendly dry method [26,27]. ...
Research on the use of WC-Co tool tip scraps inserts into Hadfield austenitic manganese steel was conducted to enhance the wear resistance of a material and utilize WC-Co tool tip scraps for mining industry applications fabricated using in situ metal casting. Microstructure, mechanical properties, and wear resistance were investigated in this study. The results of microstructure observations revealed that austenite grains near the interface region had a grain size of G 4.16. However, as the distance of the austenite grains from the interface increased, the grain size of austenite also increased and had a value of G 1.02. The interface zone between WC-Co and Hadfield austenitic manganese steel exhibited scattered agglomerates of WC-Co particles that detached from the main body, allowing for the infiltration of liquid metal inside the WC-Co tool tip scraps. The hardness testing results in the interface region showed lower values compared to the WC-Co tool tip scraps, with a hardness value of 612 VHN. Meanwhile, the hardness in the base metal region tended to decrease as the distance from the interface increased. The material with the addition of WC-Co tool tip scraps exhibited improved wear resistance compared to the wear in the base steel region.
