Formation of White Etching Layers by Deep Rolling of AISI 4140 Steel
Formation of White Etching Layers by Deep Rolling of AISI 4140 Steel
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DOI：
10.1007/s11665-020-04988-3
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发表时间：
2020-07
影响因子：
2.3
通讯作者：
P. Souza;V. M. Cangussu;M. Câmara;A. Abrão;B. Denkena;B. Breidenstein;K. Meyer
中科院分区：
文献类型：
--
作者：
P. Souza;V. M. Cangussu;M. Câmara;A. Abrão;B. Denkena;B. Breidenstein;K. Meyer
深滚压是一种有效的机械表面处理方法;然而，引起的变形可能最终导致变化，导致称为白色蚀刻层（WEL）的结构。与周围的散状材料相比，WEL具有独特的组成和性质。WEL的存在会严重影响零件的表面完整性，并损害金属部件的性能。然而，深轧对WEL形成的影响尚未完全清楚。因此，本研究的目的是调查WEL形成后，深轧AISI 4140钢与各种显微组织（通过四个热处理路线获得），并采用不同的轧制压力和进给值。结果表明，较大的晶格畸变（由细化的马氏体组织引起）和较高的深轧进给（增加的加工硬化）导致形成较厚的WEL。此外，在试验范围内，轧制压力的增加不影响WEL。最后，在WEL形成的机制进行了讨论。研究表明，与深轧相关并沿着表面晶粒施加的剪切能通过晶粒细化导致WEL的形成。
Deep rolling is an effective mechanical surface treatment method; however, the induced deformation may eventually lead to changes that result in a structure known as a white etching layer (WEL). The WEL possesses a distinct constitution and properties compared with the surrounding bulk material. The presence of the WEL drastically affects the surface integrity of the part and impairs the performance of the metallic components. However, the influence of deep rolling on WEL formation has not been fully clarified. Therefore, the goal of this study was to investigate WEL formation after deep rolling AISI 4140 steel with various microstructures (obtained through four heat treatment routes) and employing distinct rolling pressure and feed values. The results show that larger lattice distortion (resulting from refined martensitic structures) and higher deep rolling feed (increased work hardening) lead to the formation of a thicker WEL. Moreover, the increase in rolling pressure does not affect the WEL within the tested range. Finally, the mechanisms involved in WEL formation are discussed. It is suggested that the shear energy associated with deep rolling and applied along the surface grains leads to WEL formation by grain refinement.