锻压技术

不同轧制厚度TC4钛合金板材的组织与性能

英文标题：Microstructure and properties of TC4 titanium alloy sheets with different rolling thicknesses

单位：1.新疆湘润新材料科技有限公司 2.大连交通大学连续挤压教育部工程研究中心 3.长春工业大学应用技术学院

分类号：TG335.4

出版年,卷(期):页码：2022,47(6):153-159

摘要：

选取4种不同厚度的TC4钛合金轧制板材，利用金相显微镜以及力学性能试验，对其进行金相组织和力学性能研究。结果表明：经轧制及退火后的TC4钛合金板材的组织为α相与残余β相组成的混合组织，α相的形貌呈现出线条状、等轴状以及细小团状等特征；TC4钛合金板材强度总体呈现出随着厚度的增加先降低再趋于稳定的趋势，而塑性呈现出先升高再趋于稳定的趋势；当厚度为0.8 mm时，TC4钛合金板材的强度最大，抗拉强度为1075 MPa、屈服强度为1027 MPa，且4种规格TC4钛合金板材经轧制退火后沿RD与TD方向的强度与塑性均有一定差值；不同规格TC4钛合金板材拉伸后的微观断口形貌均以韧窝为主，其中厚度为0.8 mm的TC4钛合金板材沿TD方向的断口形貌中除具有韧窝形貌外，还具有一定数量的小平面，韧窝内部存在大量、特别细小的微裂纹。

Four kinds of TC4 titanium alloy rolled sheets with different thicknesses were selected, and the metallographic structures and mechanical properties of sheets with different thicknesses were studied by metallographic microscope and mechanical property test. The results show that the microstructure of TC4 titanium alloy sheets after rolling and annealing is a mixed structure composed of α phase and residual β phase, and the morphology for α phase presents the characteristics of linear, equiaxed and small clusters. With the increasing of thickness, the strength of TC4 titanium alloy shees decreases first and then tends to be stable, while the plasticity increases first and then tends to be stable. When the thickness is 0.8 mm, the strength of TC4 titanium alloy sheets is the largest, the tensile strength is 1075 MPa, and the yield strength is 1027 MPa. The strength and plasticity along the RD and TD directions for four kinds of TC4 titanium alloy sheets with different specifications after rolling and annealing are different. The fracture morphology of TC4 titanium alloy sheets with different specifications after tensile is mainly dimple. In addition to dimple morphology, there are a certain number of small planes along the TD direction for the fracture morphology of TC4 titanium alloy sheet with the thickness of 0.8 mm, and there are also a large number of especially fine micro-cracks inside the dimples.

基金项目：

自治区创新环境（人才、基地）建设专项（XJQY2009）；自治区创新环境（人才、基地）建设专项-天山创新团队计划项目（2020D14041）

同晓乐(1987-)，男，学士，中级工程师 E-mail：xjxrunjs@163.com 通信作者：岳旭(1985-)，男，硕士，高级工程师 E-mail：yuexu100@163.com

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