Effect of shot peening on metastable austenitic stainless steels
Effect of shot peening on metastable austenitic stainless steels
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DOI：
10.1016/j.msea.2015.05.079
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发表时间：
2015-08-12
期刊：
影响因子：
6.4
通讯作者：
Mateo, A.
中科院分区：
文献类型：
--
作者：
Fargas, G.;Roa, J. J.;Mateo, A.
本文对一种亚稳态奥氏体不锈钢EN-1.4318(AISI301LN)进行了喷丸处理，以评价其对奥氏体相变马氏体相的影响以及对疲劳极限的影响。考虑了两种不同的钢状态：退火态，即具有完全的奥氏体态组织；冷轧态，由奥氏体态和马氏体态的混合体组成。利用X射线衍射仪、电子背散射衍射仪和聚焦离子束以及纳米压痕技术研究了喷丸过程中的变形机制及其与疲劳响应的关系。结果表明，喷丸处理使退火后的试件发生了广泛的塑性变形和相变。然而，粗糙度的增加和微裂纹的产生对疲劳极限的改善是有限的。相比之下，喷丸冷轧试件的疲劳极限有所提高。在后一种情况下，决定疲劳响应影响的主要因素是距喷油器的距离，其次是射出速度和覆盖系数。(C)2015爱思唯尔B.V.保留所有权利。
In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with a fully austenitic microstructure, and cold rolled, consisting of a mixture of austenite and martensite. X-ray diffraction, electron back-scattered diffraction and focus ion beam, as well as nanoindentation techniques, were used to elucidate deformation mechanisms activated during shot peening and correlate with fatigue response. Results pointed out that extensive plastic deformation and phase transformation developed in annealed specimens as a consequence of shot peening. However, the increase of roughness and the generation of microcracks led to a limited fatigue limit improvement. In contrast, shot peened cold rolled specimens exhibited enhanced fatigue limit. In the latter case, the main factor that determined the influence on the fatigue response was the distance from the injector, followed successively by the exit speed of the shots and the coverage factor. (C) 2015 Elsevier B.V. All rights reserved.