A Novel Shock Processing by High-Intensity Pulsed Ion Beam
A Novel Shock Processing by High-Intensity Pulsed Ion Beam
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DOI：
10.1115/1.3139214
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发表时间：
2009-06
影响因子：
4
通讯作者：
M. Lei;X. P. Zhu;Caichi Liu;J. Xin;X. Han;P. Li;Z. Dong;Xinlin Wang;S. Miao
中科院分区：
文献类型：
--
作者：
M. Lei;X. P. Zhu;Caichi Liu;J. Xin;X. Han;P. Li;Z. Dong;Xinlin Wang;S. Miao
提出了一种利用高强度脉冲离子束（HIPIB）进行冲击加工的新方法，即离子束冲击加工（IBSP），用于高表面完整性部件的表面加工。IBSP有效地利用了HIPIB辐照对材料的耦合热力学效应，具有超快表面重熔和凝固以及可控烧蚀的特点。因此,使用IBSP HIPIB治疗参数与离子200 - 400 keV能量和离子电流密度的50 - 400 /厘米2 75 ns的脉冲宽度,即功率密度10 7 -10 8 W /厘米2,硬化扩展到几十上百微米深度达到纯铜和316 l奥氏体不锈钢,与激光冲击处理的两个订单更高的功率密度,通常不少于10 9 -10 10 W /厘米2。经IBSP处理的纯Cu和316L不锈钢的整体性能有了显著改善，包括耐磨损、耐腐蚀、疲劳和蠕变性能，这是由于在加工材料的不同深度形成了非平衡组织，例如在热影响区形成了非晶和/或纳米晶结构。在较深的区域，高密度的缺陷是由激波传播到基材中引起的残余压应力，而传统的激波处理方法无法得到这些缺陷。此外，在HIPIB辐照下，可以同时获得无裂纹的纯化和抛光表面，构成了有效提高加工材料表面完整性的完整性。IBSP的耦合热动力学效应确保了部件表面加工的高表面完整性，改善了物理和化学性能，改变了表面形貌。
A novel shock processing by high-intensity pulsed ion beam (HIPIB) is developed, referred to as ion beam shock processing (IBSP), for surface processing of components with high surface integrity. The IBSP utilizes effectively coupled thermal-dynamic effects of HIPIB irradiation onto materials, characterized by ultrafast surface remelting and solidification, and controlled ablation. As a result, using the IBSP treatment with HIPIB parameters with an ion energy of 200―400 keV and an ion current density of 50―400 A/cm 2 with a pulse width of 75 ns, i.e., a power density of 10 7 ―10 8 W/cm 2 , hardening extending to tens and hundreds of micrometers in depth is achieved on pure Cu and 316L austenitic stainless steel, which is comparable to that of laser shock processing at about two orders higher power density, usually no less than 10 9 ―10 10 W/cm 2 . Significant improvements in the overall performance including wear and corrosion resistance, fatigue, and creep properties are found for IBSP treated pure Cu and 316L stainless steel, attributable to the formation of nonequilibrium microstructures into different depths of the processed materials, e.g., amorphous and/or nanocrystalline structure in the heat-affected zone, and high-density defects in the deeper regions with residual compressive stresses caused by shock wave propagation into substrate in which the former is not obtainable in conventional shock processing. Furthermore, purified and polished surfaces free of cracks can be obtained simultaneously under HIPIB irradiation, composing the completeness for effectively enhancing the surface integrity of the processed materials. The coupled thermal-dynamic effects of IBSP assure surface processing of high surface integrity for components, with improved physical and chemical properties and modified Surface topography.