Effect of Forging Process on Microstructure of TiBw Reinforced Nearα High-Temperature Titanium Matrix Composite
摘 要
对含体积分数3% TiBw增强相的近α高温钛基复合材料进行不同应变速率(0.01~0.10 s-1)与变形量(30%~70%)的单道次单向锻造以及多向锻造,研究锻造工艺对复合材料显微组织的影响。结果表明:不同应变速率下单向锻造后,复合材料中TiBw增强相垂直于锻造方向均匀分布,随着应变速率的增加,TiBw增强相的破碎程度增大,等轴α相的含量降低,层片状α相和β转变组织的含量增加;随着变形量的增加,TiBw增强相被碎程度增大,其定向排列的趋势更加明显,等轴α相含量增加,层片状α相和β转变组织的含量降低。多向锻造后,TiBw增强相破碎,但分布无明显取向,基体组织为层片状α相和β转变组织;多向锻造态复合材料的屈服强度、抗压强度分别为1 512,1 802 MPa,比铸态复合材料的分别提高了15.4%,5.9%。
Abstract
Near α high-temperature titanium matrix containing 3vol% TiBw reinforcement was treated by single pass unidirectional forging with different strain rates (0.01-0.10 s-1) and deformation amount (30%-70%) and multi-directional forging. Then the influence of forging process on the microstructure of the composite was studied. The results show that after unidirectional forging with different strain rates, TiBw reinforament in composite distributed evenly perpendicular to the forging direction; the fragmentation degree of TiBw reinforcement increased with increasing strain rate; the content of equiaxed α phase decreased, and the content of lamellar α phase and β transition structure increased. After multi-directional forging, the fragmentation of TiBw reinforcement increased, and the directional alignment tendency was more obvious with increasing deformation amount; the content of equiaxed α phase increased, and the content of lamellar α phase and β transformed structure decreased. The TiBw reinforcement in the matrix was broken after multi-directional forging, but the distribution had no obvious orientation; the matrix structure consisted of lamellar α phase and β transition structure; the yield strength and compressive strength of multi-directional as-forged composite were 1 512, 1 802 MPa, which were 15.4% and 5.9% higher than those of as-cast composite.
中图分类号 TG316.3 DOI 10.11973/jxgccl202007003
所属栏目 试验研究
基金项目 山东省自然科学基金资助项目(ZR2017MEE038);周村区校城融合项目(2020ZCXCZH03)
收稿日期 2020/2/27
修改稿日期 2020/5/22
网络出版日期
作者单位点击查看
备注田玉晶(1995-),男,山东菏泽人,硕士研究生
引用该论文: TIAN Yujing,SUN Shichen,HU Chen,FANG Xiaoying,ZHAO Ertuan. Effect of Forging Process on Microstructure of TiBw Reinforced Nearα High-Temperature Titanium Matrix Composite[J]. Materials for mechancial engineering, 2020, 44(7): 12~17
田玉晶,孙世臣,胡辰,方晓英,赵而团. 锻造工艺对TiBw增强近α高温钛基复合材料显微组织的影响[J]. 机械工程材料, 2020, 44(7): 12~17
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【10】倪嘉,柴皓,史昆,等.颗粒增强钛基复合材料的研究进展[J].材料导报,2019,33(增刊2):369-373.
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