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金属学报  2012 

Zr-Sn-Nb新型锆合金板材加工过程中不均匀组织与织构演变

DOI: 10.3724/SP.J.1037.2011.00809, PP. 393-400

Keywords: Zr-Sn-Nb合金,微观组织,织构,不均匀形变组织,再结晶

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Abstract:

利用XRD,SEM-ECC,TEM和EBSD技术,研究了Zr-Sn-Nb系新型锆合金板材加工过程的微观组织及织构演变.结果表明,β相淬火得到的随机织构经热轧后形成沿横向倾斜的基面织构,随后的加工过程均保留该织构;热轧及两次冷轧后的基面织构都为方向平行于轧向(//RD),而退火后转变为方向平行于轧向(//RD).淬火形成的网状魏氏组织经热轧转变为不均匀形变组织,两次冷轧使组织的不均匀性更显著,最终退火得到完全再结晶组织;轧制形成的难变形晶粒多为晶粒C轴平行于轧板法向(C//ND)的取向;最终退火板材的大晶粒多为//RD的基面织构,小晶粒则以//RD为主.结合锆合金的变形及再结晶机制对轧制时产生的不均匀组织及再结晶过程的织构转变进行了分析.

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