Effect of the pouring temperature by novel synchronous rolling-casting for metal on microstructure and properties of ZLl
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Qingzhi Yan Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
Zhengyang Li Key Lab of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China (Received 27 March 2016; accepted 1 June 2016)
A novel synchronous rolling-casting for metal (SRCM) process for producing metal components is developed. In this paper, the microstructure evolution and mechanical property of ZLl04 alloy with different pouring temperatures by SRCM are investigated. In the process, the pouring temperature has great effects on the microstructure and mechanical property primarily through the crystal change in the rolling-casting area. Temperature of liquids and solids of ZL104 alloy is measured by differential scanning calorimetry. Distribution and characteristics of the microstructure of samples are examined by optical microscopy, scanning electron microscopy equipped with energy dispersive spectrometer. The results show that the samples fabricated by SRCM present uniform structure and good performance with the pouring temperature at 620 °C when the velocity of the substrate is at 10 cm/s. The tensile strength of ZLl04 alloy reaches 211.89 Mpa, while the average vickers hardness is 81.5 HV.
I. INTRODUCTION
Synchronous rolling-casting for metal (SRCM) is a novel direct manufacturing processing technology translating virtual solid model data into products in a layer by layer process. SRCM has aroused many attentions due to its short period of processing products with complicated shape and high performance.1–4 In the field of additive manufacturing, researchers usually fabricate the metal final parts or near-net parts by fusing wire or powder of raw materials and combining the liquid metal layer by layer. M. Orme developed the way of droplets without mold in 1990s,5 and C. R. Rice put forward the semisolid slurry process without mold in 2000.6 C. R. Deckard proposed the selective laser sintering. A laser is used to selectively bind a layer of powder and continuously a new layer of powder is swept over the top of the previous layer after the completion of each layer.7,8 C. W. Hull proposed the stereo lithography, in which substrate is lowered layer by layer into a vat of photopolymer liquid. At each layer, the photopolymer is selectively exposed to light, causing hardening of the Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.233
region and thus defines the part.9 S. S. Crump brought fused deposition modeling, which separately deposits both the part and support materials.10,11 Laser engineered net shaping, known as LENS, uses high energy laser beam to form and move a partial melting of molten pool; meanwhile, the metal powder or wire were poured synchronously into the molten pool. Therefore metallurgical combination of cladding is formed after cooling section, and metal components with high density are prepared by cladd
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