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Hot Rolled Ti6321 Alloy Sheets With Different Initial Microstructures: Microstructure, Mechanical Properties, and Anisotropy Characteristics
Frontiers in Materials ( IF 3.2 ) Pub Date : 2020-04-09 , DOI: 10.3389/fmats.2020.00110
Jiangkun Fan , Hao Huang , Xiangyi Xue , Wenyuan Zhang , Yang Wang , Binbin Zhang , Bin Tang , Ruifeng Zhao , Hongchao Kou , Jinshan Li

The microstructure, mechanical properties, and texture characteristics of marine titanium alloy Ti6321 sheets with four different initial microstructures were investigated contrastively in this paper. The results indicate that the strength of hot-rolled, equiaxed, and bimodal microstructure sheets exhibits significant anisotropy in the RD and TD directions. The hot rolled sheet shows the strongest anisotropy of tensile properties, that is, the transverse yield strength is 91 MPa higher than that of the rolling direction. The morphology characteristics of the macroscopic tensile fracture are also significantly different in RD and TD. The strength anisotropy of Ti6321 alloy sheet decreases with the increase of annealing temperature. The mechanical properties of the widmanstätten microstructure sheet are close to isotropic, and the plasticity is the worst among the four initial microstructures. The root cause for the properties anisotropy was analyzed by XRD and EBSD. There is a strong (1¯21¯0)[101¯0] prismatic texture and a relatively weak (1¯21¯0)[0001] basal texture in the anisotropic sheet. The anisotropic characteristics of the tensile deformation of Ti6321 alloy sheet at room temperature are mainly attributed to the difference in the Schmid factor of the basal <a> slip system and prismatic <a> slip system in TD and RD specimens.



中文翻译:

具有不同初始微结构的热轧Ti6321合金薄板:组织,力学性能和各向异性特征

本文对比研究了具有四种不同初始组织的船用钛合金Ti6321板材的组织,力学性能和织构特征。结果表明,热轧,等轴和双峰微结构板的强度在RD和TD方向上表现出明显的各向异性。热轧板表现出最强的拉伸性能各向异性,即横向屈服强度比轧制方向高91 MPa。宏观拉伸断裂的形貌特征在RD和TD上也显着不同。Ti6321合金薄板的强度各向异性随着退火温度的升高而降低。Widmanstätten微结构板的机械性能接近各向同性,在四个初始微观结构中,塑性是最差的。通过XRD和EBSD分析了属性各向异性的根本原因。有一个强大的1个¯21个¯0[101个¯0] 棱柱形纹理和相对较弱 1个¯21个¯0[0001]各向异性片中的基础纹理。Ti6321合金板在室温下的拉伸变形各向异性特征主要归因于TD和RD标本的基<a>滑移系统和棱柱形<a>滑移系统的Schmid因子不同。

更新日期:2020-04-09
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