两种氮含量690合金中晶界碳化物及晶界铬贫化研究
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-05-14
针对2 种 N含量(0.001%和0.03%, 质量分数)的 690 合金, 采用 SEM, TEM 并结合EDS 分析等手段系统研究了时效处理后合金晶界碳化物和晶界附近的 Cr 贫化行为, 并定量描述了热处理时间对晶界附近Cr 贫化程度的影响.
两种氮含量690合金中晶界碳化物及晶界铬贫化研究RESEARCH ON THE CARBIDE PRECIPITATION AND CHROMIUM DEPLETION IN THE GRAIN BOUNDARY OF ALLOY 690 CONTAINING DIFFERENT CONTENTS OF NITROGEN针对2 种 N含量(0.001%和0.03%, 质量分数)的 690 合金, 采用 SEM, TEM 并结合EDS 分析等手段系统研究了时效处理后合金晶界碳化物和晶界附近的 Cr 贫化行为, 并定量描述了热处理时间对晶界附近Cr 贫化程度的影响. 结果表明, 高 N 含量合金晶界析出的碳化物之间距离较大, 且碳化物尺寸较小, 随着时效时间延长碳化物逐渐长大. 随着时效时间的延长, 贫 Cr 区的 Cr 含量逐渐提高, 高 N 含量的 690 合金晶界附近贫 Cr区的 Cr含量高于低 N含量合金, 主要原因是晶粒细化所致.
Nickel-based alloy Inconel 690 (hereinafter called alloy 690) is currently replacing alloy 600 as steam generator tubes in pressurized water nuclear reactors, owing to its excellent resistance to intergranular stress corrosion cracking (IGSCC) and good mechanical properties. The carbide precipitation is a major microstructural characteristic during heattreatment of stainless steels and nickel-based alloys. The carbide precipitation and chromium depletion in the brain boundary of alloy 690 were investigated. The grain size and carbide of alloy 690 with 0.001% and 0.03% (mass fraction) nitrogen content were observed and analyzed. The extent of chromium depletion in the vicinity of grain boundaries was quantitatively determined as a function of thermal treatment time. The solution treatment of the samples was at 1080 ℃ for 10 min, and then the samples were thermally treated at 715 ℃ for 1~25 h. The results show that the nitrogen addition decreases the intergranular carbide density and the average carbide length but increases its distance. The level of chromium in the depleted regions in alloy 690 with 0.03%N is higher than that with 0.001%N. This is attributed to the beneficial role of nitrogen addition against grain growth and sensitization.
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