AISI 316L钢的结构分析与晶间腐蚀试验

Structural analysis and intergranular corrosion tests of AISI 316L steel.

作者信息

Stonawská Z, Svoboda M, Sozańska M, Krístková M, Sojka J, Dagbert C, Hyspecká L

机构信息

Silesian University of Technology, Department of Material Science, Krasinskiego 8, 40-019 Katowice, Poland.

出版信息

J Microsc. 2006 Oct;224(Pt 1):62-4. doi: 10.1111/j.1365-2818.2006.01664.x.

DOI:10.1111/j.1365-2818.2006.01664.x

PMID:17100908

Abstract

Pure AISI 316L steel is investigated after solution heat treatment (1050 degrees C/H(2)O) and structural sensitization (650 degrees C). Two quite different intergranular corrosion tests are used to determine the degree of structural sensitization due to the precipitation of secondary phases along the grain boundaries (mainly the M(23)C(6) and sigma-phase): the oxalic acid etch test and the electrochemical potentio-kinetic reactivation test. Generally, the dissolution of chromium-rich carbides (M(23)C(6)) is provoked by oxalic acid etch tests, whereas the chromium-depleted zones, in the vicinity of chromium-rich carbides (M(23)C(6)), are attacked by electrochemical potentio-kinetic reactivation tests. Both intergranular corrosion tests are used to determine the maximum degree of structural sensitization. Thus structural analysis by carbon replicas reveals the Laves phase, and both the M(23)C(6) and (Cr,Mo)(x)(Fe,Ni)(y) phases. The results of intergranular corrosion tests are related to the findings of the structural analysis.

摘要

对经固溶热处理（1050℃/水）和组织敏化处理（650℃）后的纯AISI 316L钢进行了研究。采用两种截然不同的晶间腐蚀试验来确定由于沿晶界析出第二相（主要是M(23)C(6)和西格玛相）而导致的组织敏化程度：草酸蚀刻试验和电化学动电位再活化试验。一般来说，草酸蚀刻试验会引发富铬碳化物（M(23)C(6)）的溶解，而富铬碳化物（M(23)C(6)）附近的贫铬区则会受到电化学动电位再活化试验的侵蚀。两种晶间腐蚀试验均用于确定组织敏化的最大程度。因此，通过碳复型进行的结构分析揭示了拉夫斯相以及M(23)C(6)相和(Cr,Mo)(x)(Fe,Ni)(y)相。晶间腐蚀试验的结果与结构分析的结果相关。