Understanding the effect of surface finish on stress corrosion crack initiation in warm-forged stainless steel 304L in high-temperature water
Understanding the effect of surface finish on stress corrosion crack initiation in warm-forged stainless steel 304L in high-temperature water
复制标题
了解表面光洁度对温锻不锈钢304L在高温水中应力腐蚀裂纹萌生的影响
DOI：
10.1016/j.scriptamat.2019.01.032
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发表时间：
2019-04-15
影响因子：
6
通讯作者：
Scenini, Fabio
中科院分区：
文献类型：
--
作者：
Chang, Litao;Burke, M. Grace;Scenini, Fabio
表面加工通常被认为是有害的应力腐蚀开裂（SCC）的核电厂部件，因为局部变形，高相关的硬度，粗糙度和拉伸残余应力。然而，在目前的工作中，SCC引发的温锻型304 L不锈钢在高温水中的研究表明，类似于1-2 μ m厚的超细晶层引入机械加工提高SCC引发阻力。通过磨削去除宏观加工脊降低了残余拉应力，但导致更广泛的开裂。这种模式的转变表明，在SCC的机械驱动力的氧化的微观结构的主导作用。(C)2019 Acta Materialia Inc.出版社：Elsevier Ltd
Surface machining is often assumed to be detrimental to stress corrosion cracking (SCC) in nuclear power plant components because of localized deformation, high associated hardness, roughness and tensile residual stresses. However, in the present work, SCC initiation studies for a warm-forged Type 304L stainless steel in high-temperature water showed that the similar to 1-2 mu m thick ultrafine-grained layer introduced by machining improved SCC initiation resistance. Removing the macroscopic machining ridges via grinding decreased the residual tensile stress but led to more extensive cracking. This paradigm shift demonstrates the dominant effect of the micro-structure on the oxidation over the mechanical driving force for SCC. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd.