The differences in damage values,residual stresses,microstructure and mechanical properties of Ti–6Al–4V alloy under hammer forging and press forging were explored through physical experiments and numerical simulati...The differences in damage values,residual stresses,microstructure and mechanical properties of Ti–6Al–4V alloy under hammer forging and press forging were explored through physical experiments and numerical simulations.The results showed that the temperature field and equivalent strain field of forgings under the hammer forging process were more uniformly distributed,resulting in smaller surface cracks and better residual stress distribution.The impact dynamic loading of hammer forging leads to forgings with higher dislocation densities,while the stabilized strain rate of press forging results in forgings exhibiting finer grain sizes.In this context,the yield strength enhancement of forgings by both processes was nearly identical,while the forgings demonstrated more excellent elongation under the hammer forging process.Additionally,increasing the number of blows in the hammer forging process or enhancing the loading rate in the press forging process can optimize the residual stress distribution of the forgings while simultaneously promoting dislocation multiplication and grain refinement.展开更多
采用普通热顶半连续铸造工艺制备∅228 mm 5083铝合金圆铸锭,分析了铸锭锻造后边部开裂的原因,并对比了工艺优化前后的圆铸锭偏析层厚度。结果表明,原工艺生产的5083铝合金圆铸锭锻造后发生周向表面裂纹的原因是,断口处受到了外界污染,...采用普通热顶半连续铸造工艺制备∅228 mm 5083铝合金圆铸锭,分析了铸锭锻造后边部开裂的原因,并对比了工艺优化前后的圆铸锭偏析层厚度。结果表明,原工艺生产的5083铝合金圆铸锭锻造后发生周向表面裂纹的原因是,断口处受到了外界污染,较高的C、O元素来源于高温下润滑剂的燃烧残留;碱金属元素、Si元素来源于结晶带及转接板上的脱模剂燃烧残留;断口内表面存在大量含Fe夹渣,来源于Fe制工具在铝液中高温下的腐蚀脱落物。针对以上问题采取了消除含Fe夹渣物的改进措施,并将铸造速度提高至95 mm/min后,铸锭偏析层厚度更薄更均匀,所生产的5083铝合金锻坯件无裂边。展开更多
基金supported by the National Natural Science Foundation of China(Nos.52175145 and 51775427)the Key Research and Development Projects of Shaanxi Province(Grant No.2023-YBGY-335).
文摘The differences in damage values,residual stresses,microstructure and mechanical properties of Ti–6Al–4V alloy under hammer forging and press forging were explored through physical experiments and numerical simulations.The results showed that the temperature field and equivalent strain field of forgings under the hammer forging process were more uniformly distributed,resulting in smaller surface cracks and better residual stress distribution.The impact dynamic loading of hammer forging leads to forgings with higher dislocation densities,while the stabilized strain rate of press forging results in forgings exhibiting finer grain sizes.In this context,the yield strength enhancement of forgings by both processes was nearly identical,while the forgings demonstrated more excellent elongation under the hammer forging process.Additionally,increasing the number of blows in the hammer forging process or enhancing the loading rate in the press forging process can optimize the residual stress distribution of the forgings while simultaneously promoting dislocation multiplication and grain refinement.
文摘采用普通热顶半连续铸造工艺制备∅228 mm 5083铝合金圆铸锭,分析了铸锭锻造后边部开裂的原因,并对比了工艺优化前后的圆铸锭偏析层厚度。结果表明,原工艺生产的5083铝合金圆铸锭锻造后发生周向表面裂纹的原因是,断口处受到了外界污染,较高的C、O元素来源于高温下润滑剂的燃烧残留;碱金属元素、Si元素来源于结晶带及转接板上的脱模剂燃烧残留;断口内表面存在大量含Fe夹渣,来源于Fe制工具在铝液中高温下的腐蚀脱落物。针对以上问题采取了消除含Fe夹渣物的改进措施,并将铸造速度提高至95 mm/min后,铸锭偏析层厚度更薄更均匀,所生产的5083铝合金锻坯件无裂边。
