摘要
采用氧化锆颗粒在不同喷射压强下对成分为Ti-47.5Al-2.5V-1.0Cr(%,原子分数)的铸造TiAl合金进行喷丸处理实验,分析试样表面状态变化及其对室温拉伸性能的影响,结果表明,喷丸处理增加了表面粗糙度,改变了试样的表面形貌,使表面损伤痕迹的大小和方向均发生变化,且在试样的表面形成残余压应力,这些表面性质的改变程度均随喷射压强的提高而增大;喷丸试样的抗拉强度因表面压应力的存在而有所提高,但由于表面损伤和表面压应力的综合作用,其室温拉伸塑性在1×105Pa喷射压强下增加,而在2×105Pa和2.5×105Pa的喷射压强下回落到原拉伸塑性水平。
The influence of shot peening treatment on the room temperature tensile properties of Ti-47.5Al- 2.5V-1.0Cr （ %, atom fraction） alloys was studied. Shot peening experiments were performed with zirconia particles at different speed. The surface characteristics of the specimens and their influence on tensile property at room temperature were analysed. The results showed that the surfaces of the peened specimens were rougher than that of the unpeened ones, and the appearance of the specimens was changed by shot peening. In addition, the residual stresses of the peened specimens became compressive compared with the unpeened ones. With the speed increase of the particles, the change was more obvious. Due to the compressive surface stress, the tensile strength was increased. And the compressive stress was considered to be beneficial to ductility. However, the rougher surface was disadvantage for tensile ductility at room temperature. Thus, the room temperature tensile elongation was increased at the particle speed of 1 - 105 Pa, and maintained at 2 ×10^5 Pa and 2.5 × 10^5 Pa.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2009年第5期750-753,共4页
Chinese Journal of Rare Metals
关键词
TIAL合金
喷丸处理
拉伸性能
TiAl alloy
shot peening treatment
tensile property
