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采用维氏硬度计和万能材料试验机进行了Zr-Sn-Nb合金薄板焊后的显微硬度、拉伸及循环变形试验,用金相显微镜和场发射扫描电镜分别分析了显微组织和断口特征。结果表明:焊缝熔合区(FZ)形成前β晶界包围的α′组织,热影响区(HAZ)基本为α+α′两相组织;FZ的硬度最高,HAZ硬度稍低,但均高于母材区(BM);FZ的抗拉强度要高于BM,但塑性降低;在高应变条件下,焊接试样的循环变形行为与母材差异明显。
Vickers hardness tester and universal material testing machine were used to test the microhardness, tensile and cyclic deformation of Zr-Sn-Nb alloy after welding. The microstructure and fracture of the Zr-Sn-Nb alloy were analyzed by metallographic microscope and field emission scanning electron microscope feature. The results show that the α ’microstructure surrounded by the β grain boundary before the weld zone (FZ) is formed, and the HAZ is basically α + α’ two-phase microstructure. The FZ hardness is the highest and HAZ hardness is slightly lower but higher In BM, the tensile strength of FZ is higher than that of BM, but the plasticity is decreased. Under high strain conditions, the cyclic deformation behavior of welded samples is obviously different from that of base metal.