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| 高氮奥氏体不锈钢1Cr22Mn15N热影响区组织特征 |
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杜挽生1, 赵琳1,2, 田志凌1, 彭云1,2, 夏明生1,2
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1.钢铁研究总院先进钢铁流程及材料国家重点实验室, 北京 100081;2.钢铁研究总院结构材料研究所, 北京 100081
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| 摘要: |
| 高氮奥氏体不锈钢(高氮钢)是利用氮代替镍进行合金化的一种合金结构钢,其焊接技术将关系着此种钢的研制开发。作者对高氮钢焊接热影响区(HAZ)的组织和硬度进行了研究。结果表明,高氮钢焊接热影响区组织为奥氏体和δ-铁素体。随着焊接冷却速度的增大,HAZ中δ-铁素体的总量越多;随着焊接峰值温度停留时间的增加,HAZ中δ-铁素体的总量越多。在合适的焊接条件下,HAZ硬度高于母材,HAZ不存在软化区。 |
| 关键词: 高氮奥氏体不锈钢 焊接热影响区 组织 硬度 |
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| 基金项目:国家重点基础研究规划(973)项目(2004CB619103) |
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| Microstructure characterization of weld HAZ in 1Cr22Mn15N high nitrogen austenitic stainless steel |
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DU Wansheng1, ZHAO Lin1,2, TIAN Zhiling1, PENG Yun1,2, XIA Mingsheng1,2
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1.State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute, Beijing 100081, China;2.Division of Structural Materials, Central Iron & Steel Research Institute, Beijing 100081, China
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| Abstract: |
| High-nitrogen austenitic stainless steel (HNS) that has good properties is a kind of structural steel alloyed with the nitrogen replacing nickel. The properties of the welded joint can affect the application of HNS, so the welding technique is considered as one of the key techniques for its applicntion. In order to study the welding technique of HNS, the microstructure and hardness of heat affected zone (HAZ) of HNS were investigated by simulation on a Gleeble-1500 thermal simulator. The experimental results indicate that the microstructure in the HAZ of HNS is austenite and δ-ferrite. Under the experimental conditions, the amount of the δ-ferrite increases when the cooling rate increase, and it increases while the staying time at the peak temperature increases. The results also show that the hardness of the HAZ is higher than that of the base metal, indicating no softening of the HAZ under appropriate welding conditions. |
| Key words: high-nitrogen austenitic stainless steel heat affected zone microstructure hardness |
