Low carbon steel with nanostructured surface layer induced by high-energy shot peening
Low carbon steel with nanostructured surface layer induced by high-energy shot peening
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DOI：
10.1016/s1359-6462(01)00738-2
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发表时间：
2001-05-18
影响因子：
6
通讯作者：
Lu, K
中科院分区：
文献类型：
--
作者：
Liu, G;Wang, SC;Lu, K
工程材料的力学性能可以通过细化其微观组织来改善。在过去的十年里，人们发展了各种利用强塑性变形来合成超细晶材料的先进技术，如等径角挤压(1，2)、冷轧(3，4)和扭转应变(5)。然而，这些技术中的大多数仍然难以在常规工程材料上实际应用。众所周知，大多数工程材料的失效对材料表面的结构和性能非常敏感，而且大多数情况下材料的失效都发生在表面。因此，表面结构和性能的优化可以有效地改善材料的整体行为。随着越来越多的证据表明纳米材料具有独特的性质，人们有理由期待通过产生纳米结构表面层来实现表面改性，即表面纳米化(SNC)(6)。采用超声喷丸(USP)方法(7)，在316L不锈钢和纯铁(8，9)表面成功地获得了纳米结构的表层。在这项工作中，我们报告了利用高能喷丸(HESP)在低碳钢表面合成纳米结构表面层。用不同的工艺表征了组织的演变，并分析了HESP处理后力学性能的变化。
Mechanical properties of engineering materials can be improved by refining their microstructures. In the past decade, various kinds of advanced techniques by using intense plastic deformation were developed to synthesize ultra-fine grained materials, such as equal-channel angular pressing (1, 2), cold-rolling (3, 4) and torsion straining (5). However, most of these techniques are still difficult for practical application to conventional engineering materials. It is known that most failures of engineering materials are very sensitive to the structure and properties of material surface, and in most cases material failures occur on the surface. Therefore, optimization of surface structure and properties may effectively improve the global behavior of material. With the increasing evidences of unique properties for nanostructured materials, it is reasonably expected to achieve surface modification by generation of a nanostructured surface layer, ie surface nanocrystallization (SNC)(6). By using the ultrasonic shot peening (USP) method (7), nanostructured surface layers were successfully obtained on a 316L stainless steel and the pure Fe samples (8, 9). In this work, we report the synthesis of a nanostructured surface layer on a low carbon steel by using a high-energy shot peening (HESP). The microstructural evolution was characterized by means of different techniques, and the change of mechanical properties after the HESP treatment was analyzed.