锻压技术

有限元模拟验证TC17钛合金前轴颈精密成形过程中变形和微观结构的关系

英文标题：Relationship between deformation and microstructure during precision forming of TC17 titanium alloy front axle neck verified by finite element simulation

作者：苏春民范茂艳钟仁智徐文帅黄常勋葛波邹吉猛

单位：贵州安大航空锻造有限责任公司

关键词：TC17钛合金显微组织变形量材料流动

分类号：TG379

出版年,卷(期):页码：2021,46(9):224-229

摘要：

通过采用有限元模拟的分析方法，研究了前轴颈锻件成形过程中材料流动速度、内部温度场和流线分布情况；采用点追踪的方法研究了锻件不同区域的金属等效应变分布和不同区域的金属最大主应力变化情况。同时，采用金相显微镜对锻件高倍显微组织进行验证分析。通过研究发现，设计的中间坯形状尺寸、压下速率和变形量合适，实际成形情况和有限元模拟结果一致。在成形过程中锻件大头端由于材料流动剧烈而出现温升，导致锻件易出现粗晶或混晶区域。另外，从温度场分布结果来看，与模具接触区域的温降较严重，为了保证锻件不出现双相组织，在类似温降区域应保证有足够的机加余量，以保证零件的组织性能满足标准要求。

The material flow velocity, internal temperature field and streamline distribution situation during the forming process of front neck forgings were studied by the analysis method of finite element simulation, and the metal equivalent strain distribution and the change situation of the maximum principal stress for metal in different regions of forgings were studied by the point tracking method. At the same time, the high magnification microstructure of forgings was verified and analyzed by metallographic microscope. Through the research, it is found that the designed geometric sizes of preforming blanks, reduction rate and deformation amount are suitable, and the actual forming conditions are consistent with the results of finite element simulation. During the forming process, the temperature of the larger end of forgings is increased because of the violent flow of material, which causes the forgings to easily appear coarse or mixed crystal area. In addition, the result of temperature distribution shows the temperature drop in the area in contact with the mold is serious. In order to avoid dual-phase structure in the forgings, there should be enough machining allowance in the similar temperature drop area to ensure that the structure and properties of parts meet the requirements of standards.

基金项目：

苏春民（1977-），男，本科，研究员级高级工程师 E-mail：suchunmin@163.com

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