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| 316L/S32101异种金属焊接接头的显微组织与力学性能研究 |
| Investigation on Microstructures and Mechanical Properties of 316L/S32101 Dissimilar Lap Joints |
| Received:September 10, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.06.019 |
| 中文关键词: 异种钢焊接 核电维修 316L不锈钢 S32101双相不锈钢 |
| 英文关键词: dissimilar steel welding maintenance of nuclear power plant 316L stainless steel S32101 duplex stainless steel |
| 基金项目:国家重大科技专项(2018ZX06002006) |
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| 中文摘要: |
| 目的 研究乏燃料水池用钢板316L与覆板S32101双相不锈钢的焊接性、接头不同区域显微组织特征及接头与母材之间的性能差异。方法 利用氩弧焊接技术对5 mm厚的316L底板与3 mm厚的S32101覆板以搭接的形式进行焊接，利用金相显微镜、扫描电镜、维氏显微硬度仪和电子万能材料试验机对焊接接头的宏观形貌、显微组织以及力学性能进行研究。结果 316L/S32101焊缝组织主要由铁素体基体、晶界树枝状奥氏体以及晶内细小片状奥氏体所组成;316L侧靠近焊缝处存在一个较窄的熔合区，其组织由奥氏体基体和少许细小分散的铁素体组成，而S32101侧靠近焊缝处组织则由粗大铁素体晶粒和沿晶粒边界分布的若干小块状奥氏体组成。从316L母材区到焊缝区，硬度显著增大，而从焊缝区到S32101母材区，硬度变化很小;焊接接头的抗拉强度高达510 MPa，为两侧316L和S32101母材强度的87.9%和88.6%。结论 在焊接电流为240 A和焊接速度为300 mm/min的条件下，可以通过氩弧焊获得成形良好的搭接接头，且接头的力学性能优异。 |
| 英文摘要: |
| The work aims to study the weldability of 316L steel plate for spent fuel pool and S32101 duplex stainless-steel overlay plate, the microstructure characteristics of different areas of the joint and the performance differences between the joint and the base metal. The 316L base plate of 5 mm thick and S32101 cladding plate of 3 mm thick were welded by argon arc welding technology in the form of overlap. The macro morphology, microstructure and mechanical properties of the welded joint were studied by metallographic microscope, scanning electron microscope, Vickers microhardness tester and electronic universal material testing machine. The results showed that the microstructure of the 316L/S32101 welded joint was mainly composed of ferrite matrix, dendritic austenite at grain boundary and fine lamellar austenite inside grain. There was a narrow fusion zone near the fusion line on the 316L side. Its microstructure was composed of austenite matrix and a few fine dispersed ferrite; while the microstructure near the weld on the S32101 side was composed of coarse ferrite grains and some small massive austenite distributed along the grain boundary. From 316L base metal zone to weld zone, the hardness increased significantly; while from weld zone to S32101 base metal zone, the hardness changed little. The tensile strength of the joint was up to 510 MPa, which was about 87.9% and 88.6% of the strength of 316L and S32101 base metal, respectively. It can be concluded that a well-formed lap joint of excellent mechanical property can be obtained by argon arc welding technology as the welding current is 240 A and the welding speed is 300 mm/min. |
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