氮和拉伸方向对无镍FeCrMnC基双相不锈钢应力腐蚀开裂敏感性的影响

Effects of Nitrogen and Tensile Direction on Stress Corrosion Cracking Susceptibility of Ni-Free FeCrMnC-Based Duplex Stainless Steels.

作者信息

Ha Heon-Young, Lee Chang-Hoon, Lee Tae-Ho, Kim Sangshik

机构信息

Ferrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, Gyeongnam, Korea.

Department of Materials Engineering and Convergence Technology, Research Center for Aircraft Part Technology, Gyeongsang National University, Chinju 52828, Gyeongnam, Korea.

出版信息

Materials (Basel). 2017 Mar 15;10(3):294. doi: 10.3390/ma10030294.

DOI:10.3390/ma10030294

PMID:28772651

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5503365/

Abstract

Stress corrosion cracking (SCC) behavior of Ni-free duplex stainless steels containing N and C (Fe-19Cr-8Mn-0.25C-(0.03, 0.21)N, in wt %) was investigated by using a slow strain rate test (SSRT) in air and aqueous NaCl solution with different tensile directions, including parallel (longitudinal) and perpendicular (transverse) to the rolling direction. It was found that alloying N was effective in increasing the resistance to SCC, while it was higher along the longitudinal direction than the transverse direction. The SCC susceptibility of the two alloys was assessed based on the electrochemical resistance to pitting corrosion, the corrosion morphology, and the fractographic analysis.

摘要

通过在空气中以及不同拉伸方向（包括平行（纵向）和垂直（横向）于轧制方向）的NaCl水溶液中进行慢应变速率试验（SSRT），研究了含氮和碳的无镍双相不锈钢（Fe-19Cr-8Mn-0.25C-(0.03, 0.21)N，重量百分比）的应力腐蚀开裂（SCC）行为。结果发现，合金化氮在提高抗应力腐蚀开裂能力方面是有效的，并且纵向的抗应力腐蚀开裂能力高于横向。基于对点蚀的电化学抗性、腐蚀形态和断口分析，评估了这两种合金的应力腐蚀开裂敏感性。