Centrifugal Casting Technology for Bimetallic Composite Component
WANG Yujin1, QIN Fangcheng1, QI Huiping2, LI Yongtang2, QI Haiquan1, MENG Zhengbing1
1 Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, Guilin University of Technology, Guilin 541004, Guangxi, China 2 Shanxi Key Laboratory of Metallic Materials Forming Theory and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China
Abstract: Roller, seamless pipe and ring parts with the functions of bearing, connecting and driving are the key basic components of high-end equipment including nuclear power plant, petrochemical and large rolling mill. They are characterized by many varieties, large amount and wide application. The properties of single-metallic roller, pipe and ring parts are difficult to meet the performance requirements for major equipment service in extreme harsh conditions. For example, under high wear and high corrosion environment, not only the mechanical properties of the component should be considered, but also the service performance of the component should be improved and its life should be prolonged by adopting anti-wear and anti-corrosion alloy. Therefore, the advantage complementary of single-metal material can be realized by compounding two materials with different properties to the bimetallic composited components. When the performance of one-side is high, the rare and precious materials can be replaced by the bimetallic components, which are widely used in the fields of deep space exploration, wind power, petrochemicals and ocean-going ships, etc. Due to the difference of structure and performance in the bimetallic materials, the key of the composite in bimetallic components is characterized by the interface morphology and bonding characteristics. After decades of research and development, the centrifugal casting of bimetallic composited roller and pipes have been achieved. For the bimetallic composited roller, the outer-layer and inner-layer are produced by the horizontal centrifugal casting and gravity filling casting, respectively. And both the outer- and inner-layers in the bimetallic composited pipe are produced by the horizontal centrifugal casting. The morphology of the bimetallic bonding interface is affected by the pouring temperature of the outer-layer, intervals between inner- and outer-layers and rotate speed of casting mould. The effect factors of the bonding thickness are mainly pouring temperature and solidification method. The mechanical properties of composited components heavily depends on the bonding interface. During the centrifugal cas-ting of bimetallic composited roller and pipe, the electromagnetic control, multi-alloy modification and step heat treatment after centrifugal casting can improve the morphology and the uniformity of composition distribution in bonding interface, which lead to the improvement in bonding properties. The composited mechanism of centrifugal casting is mainly characterized by metallurgical bonding. In this paper, the research status on the centrifugal casting of bimetallic components is summarized. Taking the bimetallic roller and bimetallic pipe for example, the forming feature and rule of centrifugal casting are analyzed. The effect of processing parameters on bonding interface and properties are discussed. The mechanisms of microstructure evolution in centrifugal casting are revealed. The existing problems in the centrifugal casting of bimetallic components are pointed out. Combining the features of disc-shaped ring parts, the trends and focused research contents on the centrifugal casting of bimetallic composited components are expected.
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