Effect of a Laths Size Distribution on Deformation Behaviour of Ti-5 Al-5Mo-5 V-3Cr
The strengthening of the titanium alloy is largely provided by the alpha laths that precipitated during the cooling phase. As in a structural strengthening behaviour, the dimension and the relative orientation of these laths in the beta matrix determine the level of the mechanical resistance of the alloy. The dimension of the laths is mainly dependent on the thermal treatment (the set temperature, the heating and the cooling phase together). The relative orientation between the laths could be strongly managed by the deformation applied during the die forging process. Aubert & Duval have tested different levels of deformation on Ti 5553 parts. Various slow cooling conditions after annealing have been used on these parts in order to generate different sizes of the alpha laths. The distribution of the sizes of the laths and the distribution of the orientations of the laths have been measured by image analysis onto SEM micrographs. TEM analyses have been performed as well to investigate the crystal-lographic relationships between the fine alpha laths and the beta matrix. Moreover, the mechanical performances associated with these specific microstructures have been tested with tensile test. It appears in particular that the level of deformation promotes the elongation before rupture. This paper presents the impact of the orientations of the alpha laths on mechanical properties and a short theoretical approach to model it.
Ti5553 deformation size and orientation of alpha laths Burgers orientation relationships
Nicolas Escalé Pauline Audigié Christophe Daffos Stéphane Hollard Philippe Héritier
CEMES/CNRS 29,rue Jeanne Maruig,BP 9434 7,31055 Toulouse Cedex 4,France Metallurgical department,Aubert & Duval,Pamiers 09100,France
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
698-704
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）