Dissimilar Friction Stir Welding of Austenitic and Duplex Stainless Steel: Effect of Material Position and Tool Offset,Steel Research International

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Dissimilar Friction Stir Welding of Austenitic and Duplex Stainless Steel: Effect of Material Position and Tool Offset
Steel Research International ( IF 1.9 ) Pub Date : 2020-08-01 , DOI: 10.1002/srin.202000156
Wenyang Wang _{1,

2} , Zhaoxin Wang _{1,

2} , Lixia Xu _{1,

2} , Ye Hu _{1,

2} , Hongwei Zhao _{1,

2}

Affiliation

Dissimilar friction stir welding (FSW) of 2205 duplex stainless steel (2205 DSS) and 304 austenitic stainless steel (304 ASS) is carried out with various parameters. The effect of material position and tool offset on material flow and mixing, the microstructure, and the mechanical properties of joints are investigated, and the relationship between tool torque and material flow is determined. With tool offset to retreating side (RS), defect‐free joints with proper material mixing are fabricated. When 304 ASS is placed on the advancing side (AS), the material mixing is better than is the case with the opposite material position, but results in a larger stirring zone (SZ) width. A large amount of mixed zone (MXZ) with a different phase ratio (γ–α) from both base metals (BMs) is formed in the defect‐free joints due to the alloying element diffusion between the two steels and severe plastic deformation. Due to the dynamic recrystallization, the SZ of all joints has higher hardness than 304 BM. The defect‐free dissimilar joints have higher tensile strength than 304 BM and good ductility.

中文翻译：

奥氏体和双相不锈钢的不同搅拌摩擦焊：材料位置和工具偏移量的影响

使用各种参数对2205双相不锈钢（2205 DSS）和304奥氏体不锈钢（304 ASS）进行不同的摩擦搅拌焊接（FSW）。研究了材料位置和刀具偏置对材料流动和混合，接头的微观结构和机械性能的影响，并确定了工具扭矩与材料流动之间的关系。通过使刀具向后退侧（RS）偏移，可以制造出具有适当材料混合的无缺陷接头。当将304 ASS放置在前进侧（AS）时，物料混合比在相反物料位置的情况下更好，但是会导致较大的搅拌区（SZ）宽度。大量具有不同相位比（γ – α的混合区（MXZ）由于两种钢之间的合金元素扩散和严重的塑性变形，两种母材（BM）在无缺陷的接头中形成。由于动态再结晶，所有接头的SZ硬度均高于304 BM。无缺陷的异种接头具有比304 BM高的抗张强度和良好的延展性。

更新日期：2020-09-30

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