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晶界特征对316不锈钢沿晶应力腐蚀开裂裂纹萌生的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2016-01-05
研究了晶界结构特征及晶界 2 侧晶粒的变形难易程度(Schmid 因子)对 316 不锈钢(316SS)不同晶界萌生应力腐蚀开裂(SCC)裂纹的影响. 通过形变及热处理工艺获得晶粒尺寸较大的样品, 制作成薄样品, 使样品厚度相当于一个晶粒的尺寸. 采用三点弯曲加载方式, 在沸腾的酸化 NaCl 溶液中进行 SCC 实验来研究 316SS 不同晶界萌生 SCC 裂纹的倾向性.
晶界特征对316不锈钢沿晶应力腐蚀开裂裂纹萌生的影响EFFECTS OF GRAIN BOUNDARY CHARACTER ON INTERGRANULAR STRESS CORROSION CRACKING INITIATION IN 316 STAINLESS STEEL
研究了晶界结构特征及晶界 2 侧晶粒的变形难易程度(Schmid 因子)对 316 不锈钢(316SS)不同晶界萌生应力腐蚀开裂(SCC)裂纹的影响. 通过形变及热处理工艺获得晶粒尺寸较大的样品, 制作成薄样品, 使样品厚度相当于一个晶粒的尺寸. 采用三点弯曲加载方式, 在沸腾的酸化 NaCl 溶液中进行 SCC 实验来研究 316SS 不同晶界萌生 SCC 裂纹的倾向性. 结果表明, 沿晶型的 SCC 裂纹在随机晶界处萌生的倾向性最高, 而在 Σ3 晶界处的SCC 裂纹萌生倾向性很低. 分别统计了大量随机晶界和 Σ3 晶界 2 侧晶粒的 Schmid 因子及其差值的绝对值(△m), 结果表明, 随机晶界数量随△m 值的变化规律不明显, Σ3 晶界数量随△m 值增大明显下降; 在 0＜△m＜0.1 范围内, 随机晶界和 Σ3 晶界萌生 SCC 裂纹的倾向性都随着△m 的增加而增加.
316stainless steel (316SS) is widely used due to a combination of good mechanical properties and excellent corrosion resistance. However, the intergranular stress corrosion cracking (IGSCC) is a serious problem for 316SS exposed to aggressive environments, which could result in unexpected failures and lead to huge losses. The grain boundary structure and local stress applied on the grain boundary are proved to have significant influence on the initiation of the IGSCC. In this work, thermal-mechanical processing was applied to the 316SS to yield a large-grained sample. The sample plates with a single-grained thickness were subjected to three-points bending SCC tests in an acidified boiling 25%NaCl solution. The result shows that the random grain boundaries (GBs) have the highest propensity to IGSCC initiation, while the Σ3 GBs shows very low tendency to IGSCC initiation. The absolute values of Schmid factor mismatch (△m) between the grains on both sides of the GBs were analyzed for a large number of GBs. The distribution of the △m for the Σ3 GBs is obviously different from that of the random GBs. The △m has significant influence on the IGSCC susceptibility in the range of 0＜△m＜0.1. The larger value of the △m, the higher propensity for the IGSCC initiation at the GBs, for both the random GBs and the Σ3 GBs.
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