基于VAR数值模拟的新型Ti551钛合金熔炼工艺研究OA

To meet the demand for pressure-resistant materials in deep-sea equipment,this study invest-igated the melting process of a novel α+β titanium alloy Ti551 based on Vacuum Arc Remelting(VAR)numerical simulation.By optimizing parameters through numerical simulation,the melting process was directly scaled up from a 150 kg model to produce 3-ton industrial-scale ingots via VAR.The results demonstrate the successful production of high-purity,highly homogeneous 3-ton Ti551 industrial in-gots.The study focused on the effects of melting current and arc-stabilizing current on compositional homogeneity and pool profile,identifying reduced melting current as the optimal parameter.Through comparative experiments of five different melting processes,it was concluded that the optimized pro-cess conditions—a melting current of 21～24 kA,an arc-stabilizing current of 15 A,and an AC arc sta-bilization time of 30 s—yielded the best results.Based on this optimized process,the produced 3-ton in-dustrial ingots exhibited a smooth surface free from defects such as cold shuts,subsurface porosity,and slag inclusions.The ingots demonstrated good compositional uniformity,with the range of key ele-ments including Cr,Fe,Sn,V,and Zr all within 0.03,indicating no significant macrosegregation.The overall properties meet the stringent requirements for raw materials used in deep-sea equipment.