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| 氮对316L不锈钢焊缝凝固模式和组织的影响 | |
| 引用本文： | 邓宝柱,马成勇,彭云,田志凌,廖丕博.氮对316L不锈钢焊缝凝固模式和组织的影响[J].焊接学报,2010,31(5):89-92. |
| 作者姓名： | 邓宝柱 马成勇 彭云 田志凌 廖丕博 |
| 作者单位： | 1. 昆明理工大学机电工程学院,昆明,650093;钢铁研究总院结构材料研究所,北京,100081 2. 钢铁研究总院结构材料研究所,北京,100081 3. 昆明理工大学机电工程学院,昆明,650093 |
| 摘 要： | 采用氮含量不同的三种焊丝分别对316L奥氏体不锈钢进行了TIG焊接,通过金相显微镜和扫描电镜对其焊缝微观组织进行了观察,对比分析了焊缝的凝固模式和焊缝组织的析出行为,研究了氮对焊缝凝固模式和组织的影响.结果表明,焊缝氮含量为0.018%时,焊缝的主要凝固模式为初生相为铁素体的FA模式,δ铁素体以蠕虫状或网状分布于枝晶轴上;氮含量增加到0.088%和0.16%时,焊缝的主要凝固模式转变为初生相为奥氏体的AF模式,δ铁素体以颗粒状分布于初生奥氏体枝晶间,其数目明显减少;焊缝奥氏体组织随着氮含量的增加有明显的粗化趋势. |
| 关 键 词： | 氮 焊接 组织 凝固模式 |
| 收稿时间： | 2008/12/15 0:00:00 |
Effect of nitrogen on solidification mode and microstructure of 316L stainless steel |
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| DENG Baozhu,MA Chengyong,PENG Yun,TIAN Zhiling and LIAO Pibo.Effect of nitrogen on solidification mode and microstructure of 316L stainless steel[J].Transactions of The China Welding Institution,2010,31(5):89-92. | |
| Authors: | DENG Baozhu MA Chengyong PENG Yun TIAN Zhiling and LIAO Pibo |
| Affiliation: | Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650093, China;Institute of structural Materials, Central Iron & Steel Research Institute, Beijing 10081, China,Institute of structural Materials, Central Iron & Steel Research Institute, Beijing 10081, China,Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650093, China;Institute of structural Materials, Central Iron & Steel Research Institute, Beijing 10081, China,Institute of structural Materials, Central Iron & Steel Research Institute, Beijing 10081, China and Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650093, China |
| Abstract: | Three kinds of welding wires with different ni-trogen contents were used for TIG welding of 316L austenitic stainless steel.The solidification mode of the welds and the pre-cipitation behavior of austenite and ferrite were contrastively ana-lyzed,and the effect of nitrogen on solidification mode and mi-crostructure of the weld metal was investigated.The results show that the weld with nitrogen content of 0.018% solidifies as pri-mary ferrite mode and vermicular or skeletal ferrite remains on the dendritic axis.With the increase of nitrogen content to 0.088% and 0.16%,the weld solidifies as primary austenite mode and ferrite occurs as small particles between primary aus-tenite dendrites;the ferrite number (FN) decreases and the re-markably coarse austenite is also found. |
| Keywords: | nitrogen welding microstructure solidification mode |
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