Transactions of Materials and Heat Treatment

Title：Influence of forging process on microstructure, mechanical properties and corrosion resistance property for Zr-4 alloy tube billet

Authors： Chu Linhua Yuan Gaihuan Xu Shitong Gao Bo Yao Meiyi Luo Qianqian Tong Longgang

Unit： State Nuclear Bao Ti Zirconium Industry Company National Energy R&D Center of Nuclear Grade Zirconium Material Shanxi Key Laboratory of Nuclear Grade Zirconium Material Institute of Materials Shanghai University

KeyWords： zirconium alloy forging microstructure texture the second phase particles corrosion mechanical properties

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2020,45(5):6-14

Abstract：

In order to study the influences of different forging processes on microstructures and properties for Zr-4 alloy tubes, based on the primary forging billet, the secondary forging was conducted in α phase, (α+β) phase and β phase areas respectively, three kinds of Φ63.5 mm×10.9 mm tube billets were obtained after undergoing the same quenching, extrusion, rolling and heat treatment processes, and the microstructures of tube samples were analyzed by OM, SEM, TEM and EBSD. Then, the steam corrosion test at 500 ℃ and 400 ℃/10.3 MPa was conducted in static autoclave respectively, and the mechanical properties of samples were compared by the tensile tests at room temperature and high temperature (380 ℃). The results show that the second forging process in α phase area at low temperature increases the fracture degree of grains for forged billets and realizes the grain refinement of final tubes to enhance the tensile properties. In addition, the second phase particles are mainly distributed along the grain boundaries, and the grain refinement also forms more grain boundaries to increase the quantity of the second phase particles and improve the distribution uniformity to a certain extent. Meanwhile, the surface layer of billet forged at low temperature gets greater deformation, the grain orientation of hcp structure tube changes, and the normal direction for cylinder surface of sample with better corrosion resistance property is perpendicular to the rolling direction of tube. Thus, the comprehensive effects of the second phase particles and texture improve the corrosion resistance property of Zr-4 alloy tubes significantly.

Funds：

国家科技重大专项（2015ZX06004-001）

储林华（1984-），男，工学博士，高级工程师，E-mail：chulinhuascu@163.com

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