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| S22053双相不锈钢接头组织和性能研究 |
| Microstructure and Properties of S22053 Duplex Stainless Steel Joint |
| Received:December 03, 2019 Revised:March 10, 2020 |
| DOI：10.3969/j.issn.1674-6457.2020.02.012 |
| 中文关键词: 双相不锈钢 微观组织 力学性能 铁素体含量 |
| 英文关键词: duplex stainless steel microstructure mechanical properties ferrite content |
| 基金项目: |
| Author Name | Affiliation | | SUN Jun-feng | Jiujiang Haitian Equipment Manufacturing Co., Ltd., Jiujiang 332100, China | | REN Ze-liang | Jiujiang Haitian Equipment Manufacturing Co., Ltd., Jiujiang 332100, China | | ZHAN Guo-ping | Jiujiang Haitian Equipment Manufacturing Co., Ltd., Jiujiang 332100, China | | WANG Yan-dong | Jiujiang Haitian Equipment Manufacturing Co., Ltd., Jiujiang 332100, China | | ZHANG Cheng-gao | Jiujiang Haitian Equipment Manufacturing Co., Ltd., Jiujiang 332100, China |
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| 中文摘要: |
| 目的 研究S22053双相不锈钢焊接接头组织和力学性能变化规律。方法 在依托S22053双相不锈钢焊接经验的基础上，采用SMAW和SAW焊接方法对两种不同焊材（E2209和ER2009+GXS-330）的焊接接头进行了力学性能、晶间腐蚀、微观金相和铁素体含量检测试验。结果 两种焊材基本都满足S22053的焊接要求，接头由奥氏体和铁素体组成，铁素体为基体，奥氏体被铁素体基体包围着，3组试验的奥氏体晶粒大小和组织形态变化较大，焊缝中粗大的奥氏体占据了大片区域，局部有魏氏组织产生，奥氏体按一定方向的板条状分布，也有部分以片状分布，接头抗拉强度均达到了母材强度的97%，经90°侧弯后表面无可见裂纹，无晶间腐蚀产生的裂纹，铁素体质量分数均在35%~65%。结论 3组试验的奥氏体晶粒大小和组织形态变化较大，其中Φ3.2 mm的E2209焊条焊缝晶粒最为细小，宜选用此种焊接方法，3组试验的晶间腐蚀、铁素体含量、抗拉强度和伸长率，均符合标准要求，90°侧弯后表面无任何可见裂纹。 |
| 英文摘要: |
| The paper aims to study the microstructure and mechanical properties of S22053 duplex stainless steel welded joint. Based on the welding experience of S22053 duplex stainless steel, SMAW and saw welding methods were used to test the mechanical property, intergranular corrosion, micro metallograph and ferrite content of joints welded with two different welding materials (E2209 and ER2009+Gxs-330). The two kinds of welding materials basically met the welding requirements of S22053. The joint was composed of austenite and ferrite. The ferrite was the matrix, and the austenite was surrounded by the ferrite matrix. The austenite grain size and structure morphology of the three groups of tests changed greatly. The coarse austenite in the weld occupied a large area, and there were local widmanstatten structures. The austenite was distributed in a certain direction in the strip shape, and there were also some sheet parts. The tensile strength of the joint was 97% of the strength of the base metal. After 90° of side bending, there was no visible crack or intergranular corrosion crack on the surface. The content of ferrite was 35%-65%. The austenite grain size and microstructure of the three groups of tests vary greatly, of which the weld grain of mm E2209 electrode of Φ3.2 mm is the smallest, so this welding method should be selected. The intergranular corrosion, ferrite content, tensile strength and elongation of the three groups of tests all meet the requirements of the standard, and there is no visible crack on the surface after 90 ° of side bending. |
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