中国激光, 2017, 44 (8): 0802003, 网络出版: 2017-09-13
深冷激光喷丸强化2024-T351铝合金拉伸性能及断口分析 下载: 1130次
Tensile Property and Fracture Analysis of 2024-T351 Aluminum Alloys by Cryogenic Laser Peening
激光技术 深冷激光喷丸强化 拉伸性能 断口形貌 laser technique cryogenic laser peening tensile property fracture morphology
摘要
对2024-T351铝合金进行了深冷激光喷丸强化(CLP)处理。结果表明, CLP处理使得2024-T351铝合金的表层金属发生了有效的晶粒细化, 严重塑性变形层的晶粒尺寸大多在10 μm以下, 材料内第二相分布更为均匀; CLP处理后试样的表面硬度、抗拉强度和屈服强度比未处理样品的分别提高了34.1%、21.6%和28.9%, 材料的延伸率也略有提高, 实现了强度和塑性的同步增强。拉伸断口形貌表明, 2024-T351铝合金经CLP处理后的断裂形式为韧性断裂, 这有利于改善铝合金的拉伸性能。
Abstract
The cryogenic laser peening (CLP) of 2024-T351 aluminum alloys is performed. The results show that the effective grain refinement on the surface of 2024-T351 aluminum alloys is induced by the CLP, the grain size in the severe plastic deformation layer is mostly smaller than 10 μm, and the second-phase distribution is more homogeneous. Compared with those of untreated samples, the surface hardness, the tensile strength and the yield strength of samples treated by the CLP increase by 34.1%, 21.6% and 28.9%, respectively, and the elongation of materials increases slightly. The simultaneous improvement of strength and ductility is realized. The tensile fracture morphology indicates that the fracture form of 2024-T351 aluminum alloys strengthened by the CLP is a ductile fracture which is beneficial to improve the tensile property of aluminum alloys.
孙云辉, 周建忠, 盛杰, 黄舒, 徐苏强, 李京, 徐高峰. 深冷激光喷丸强化2024-T351铝合金拉伸性能及断口分析[J]. 中国激光, 2017, 44(8): 0802003. Sun Yunhui, Zhou Jianzhong, Sheng Jie, Huang Shu, Xu Suqiang, Li Jing, Xu Gaofeng. Tensile Property and Fracture Analysis of 2024-T351 Aluminum Alloys by Cryogenic Laser Peening[J]. Chinese Journal of Lasers, 2017, 44(8): 0802003.