文献类型：期刊文献

英文题名：Mechanism-related modelling of pit evaluation in the CrNiMoV steel in simulated environment of low pressure nuclear steam turbine

作者：Luo, Linghua[1];Huang, Yuhui[1];Weng, Shuo[1];Xuan, Fu-Zhen[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, MOE, Shanghai 200237, Peoples R China

年份：2016

卷号：105

起止页码：240

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20162402481115);WOS:【SCI-EXPANDED(收录号:WOS:000378768400027)】；

基金：The authors are grateful for the support provided by the National Natural Science Foundation of China (51325504) and the Program of Shanghai Subject Chief Scientist under award No. 14XD1401300.

语种：英文

外文关键词：Low alloy steel; Welded joint; Pitting corrosion; Modelling

摘要：Pit initiation and growth in a 25Cr2Ni2MoV welded joint in the simulated environment of a low pressure nuclear steam turbine was addressed by using U-bend samples. Different pit densities in various zones of the welded joint were observed with the order: weld near heat affected zone > base metal near heat affected zone > heat affected zone. This was partly ascribed to the galvanic effect and material difference. Pits in the base metal emanated from local deep grooves of surface machining, while they nucleated from surface inclusions in weld metal. A model for pit distribution of the welded joint was developed and verified accordingly. (C) 2016 Elsevier Ltd. All rights reserved.