An accurate flow stress model was established by considering the parameters of strain rate,strain and temperature as well asβ→a+βphase transformation in order to develop the plastic forming theory of TC18 titanium ...An accurate flow stress model was established by considering the parameters of strain rate,strain and temperature as well asβ→a+βphase transformation in order to develop the plastic forming theory of TC18 titanium alloy.Firstly,the phase transition kinetics of TC18 titanium alloy during isothermal and continuous cooling at 1073 and 1273 K was studied by thermodynamic calculation,meanwhile,the relationship of volume fraction of phase transition with temperature and time was obtained.Constitutive models were calculated by investigating flow behaviors under hot compression tests with the strain rates of 0.001-1s^(-1) and temperatures of 973-1223 K in the singleβand a+βregions in TC18 titanium alloy,respectively.By combining the phase transformation dynamic kinetics with constitutive models,an accurate flow stress model was established,providing theoretical basis and data support for the hot forging of TC18 titanium alloy.展开更多
文章对电弧熔丝增材制造技术(Wire and Arc Additive Manufacturing,WAAM)的发展历史、应用状况进行了全面的叙述,对各材料在制造过程中出现的共性缺陷(包括焊后变形、孔隙和裂缝等)的产生原因及各种提高制造质量的处理工艺进行了分析,...文章对电弧熔丝增材制造技术(Wire and Arc Additive Manufacturing,WAAM)的发展历史、应用状况进行了全面的叙述,对各材料在制造过程中出现的共性缺陷(包括焊后变形、孔隙和裂缝等)的产生原因及各种提高制造质量的处理工艺进行了分析,最后结合现有的电弧熔丝增材制造材料流变、热流场密度、晶粒演化数学模型,从降低电弧熔丝增材制造制件缺陷,提升产品质量及综合性能,研发增材制造新算设备、新工艺、新数学模型方面对电弧熔丝增材制造技术的发展方向进行了展望。展开更多
基金Funded by the National Natural Science Foundation of China(No.52075058)the Natural Science Foundation of Chongqing(No.cstc2021jcyj-msxmX1112)the Research and Demonstration of Key Technologies for Forging High-performance Aluminum Alloys for Aerospace Applications(No.Z20210348)。
文摘An accurate flow stress model was established by considering the parameters of strain rate,strain and temperature as well asβ→a+βphase transformation in order to develop the plastic forming theory of TC18 titanium alloy.Firstly,the phase transition kinetics of TC18 titanium alloy during isothermal and continuous cooling at 1073 and 1273 K was studied by thermodynamic calculation,meanwhile,the relationship of volume fraction of phase transition with temperature and time was obtained.Constitutive models were calculated by investigating flow behaviors under hot compression tests with the strain rates of 0.001-1s^(-1) and temperatures of 973-1223 K in the singleβand a+βregions in TC18 titanium alloy,respectively.By combining the phase transformation dynamic kinetics with constitutive models,an accurate flow stress model was established,providing theoretical basis and data support for the hot forging of TC18 titanium alloy.
文摘文章对电弧熔丝增材制造技术(Wire and Arc Additive Manufacturing,WAAM)的发展历史、应用状况进行了全面的叙述,对各材料在制造过程中出现的共性缺陷(包括焊后变形、孔隙和裂缝等)的产生原因及各种提高制造质量的处理工艺进行了分析,最后结合现有的电弧熔丝增材制造材料流变、热流场密度、晶粒演化数学模型,从降低电弧熔丝增材制造制件缺陷,提升产品质量及综合性能,研发增材制造新算设备、新工艺、新数学模型方面对电弧熔丝增材制造技术的发展方向进行了展望。
