以EBSD技术表征奥氏体不锈钢形变及焊接后抗有害元素迁移

Characterization of Resistance to Harmful Element Migration after Deformation and Welding of Austenitic Stainless Steel by EBSD Technique

摘要:

奥氏体不锈钢用于饮用水管制作时需经弯管形变和焊接工艺，该工艺过程引起的不锈钢组织结构演变将影响其抗腐蚀性能。通过背散射电子衍射技术分析奥氏体不锈钢经某弯管形变和焊接后的晶粒度、相组成、织构等变化，结果表明：弯管形变对不锈钢内部组织结构的影响甚微，不会引起有害元素迁移量增加，而焊接对不锈钢内部组织结构的影响更大，可能是造成金属元素迁移的重要因素。

Abstract:

When austenitic stainless steel is used in the production of drinking water pipes， it needs to undergo a bending deformation and welding process. The evolution of the stainless steel structure caused by this process will affect its corrosion resistance. In this paper， the changes in grain size， phase composition， texture， etc. of austenitic stainless steel after bending and welding were analyzed by backscattered electron diffraction technique. The results show that the bending deformation has little effect on the internal microstructure of stainless steel and will not increase the migration of harmful elements， while welding has a greater impact on that， which may be an important factor for the migration of metal elements.