| 碳含量对C-276合金组织及晶间腐蚀敏感性的影响 |
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| 引用本文： | 李艳美,王明家,张斌,张爽,刘聪,马忠仁,万志永.碳含量对C-276合金组织及晶间腐蚀敏感性的影响[J].有色金属科学与工程,2020,11(4):56-63. |
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| 作者姓名： | 李艳美 王明家 张斌 张爽 刘聪 马忠仁 万志永 |
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| 作者单位： | 1.秦皇岛核诚镍业有限公司，河北 秦皇岛 066200 |
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| 摘 要： | 选取不同碳含量的C-276合金板材样品，先对样品进行固溶处理，随后在900 ℃下进行不同时间的敏化处理。采用ASTM G28中A法，对固溶及敏化后的C-276样品进行晶间腐蚀敏感性试验，得出C-276材料的晶间腐蚀年腐蚀率随敏化时间的增加而增加，即延长敏化时间会增加C-276合金的晶间腐蚀敏感性。固溶状态下，高碳型C-276合金晶间腐蚀敏感性高于低碳型C-276合金；而在900 ℃敏化30 min以后，低碳型C-276合金呈现出更高的晶间腐蚀敏感性。采用金相显微镜和扫描电镜（SEM）研究碳含量对C-276合金显微组织的影响，固溶态下，低碳型合金晶界和晶粒内部均未发现有明显析出相，而高碳型C-276合金在部分晶界和晶粒内部分布着颗粒状富含Mo的析出相μ相。敏化过程中，无论低碳还是高碳型C-276合金，其析出相均为富含Mo的M6C型碳化物。高碳型C-276合金中，由于μ相对Mo元素起到钉扎作用，导致富含Mo的碳化物析出速度减缓，因此在敏化后，高碳型C-276合金具有更低的晶间腐蚀敏感性。
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| 关 键 词： | C-276合金 敏化处理 晶间腐蚀 碳化物 析出相 |
| 收稿时间： | 2020-07-09 |
Effect of carbon content on microstructure and intergranular corrosion susceptibility of C-276 alloy |
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| Affiliation: | 1.Qinhuangdao Hecheng Nickle Co., Ltd., Qinhuangdao 066200, Hebei, China2.Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China3.CITIC Dicastal Co., Ltd., Qinhuangdao, Qinhuangdao 066011, Hebei, China |
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| Abstract: | Samples of different carbon content C-276 alloy plate were selected. The samples were solution treated first, and then sensitized at 900 ℃ for different times. The method A of ASTM G28 was used to test the intergranular corrosion of C-276 samples with solution and sensitization. The results showed that the annual corrosion rate of C-276 alloy increased with the increase of sensitization time, and the intergranular corrosion sensitivity of C-276 alloy increased with the increase of sensitization time. The intergranular corrosion sensitivity of high carbon type C-276 alloy is higher than that of low carbon type C-276 alloy in solid solution state. After sensitization at 900 ℃ for 30 minutes, low carbon C-276 alloy shows higher intergranular corrosion sensitivity. The effect of carbon content on the microstructure of C-276 alloy was studied by metallographic microscope and scanning electron microscope (SEM). In the solution state microstructure of low carbon C-276 alloy, no obvious precipitates were found at the grain boundary and inside the grains. In the solution state microstructure of high carbon C-276 alloy, the precipitated phase μ phase rich in Mo is distributed in part of the grain boundary and inside the grain. No matter low carbon or high carbon C-276 alloy, the precipitated phase in sensitization process is Mo rich M6C carbide. In the high carbon C-276 alloy, the precipitation rate of Mo rich carbides is slowed down due to the pinning effect of μ on Mo. Therefore, low carbon C-276 alloy has higher intergranular corrosion sensitivity after sensitization. |
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