2205双相不锈钢摩擦焊接头显微组织及微区蠕变性能
Microstructure and creep property of friction welding in 2205 duplex stainless steel
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摘要: 对2205不锈钢进行连续驱动摩擦焊接,通过光学显微镜观察接头显微组织,利用纳米压痕仪对接头组织中铁素体(δ相)和奥氏体(γ相)进行硬度测试及压痕蠕变行为分析。结果表明,摩擦焊接头由塑性变形区及焊合区构成,变形区内γ相与δ相相比,因塑性流动而硬化的现象更为显著,且具有更高的纳米硬度和弹性模量;基于保载过程中应变率和硬度对数关系,经线性拟合得到蠕变应力指数n,能够较好地反映δ相和γ相的蠕变特性,而且纳米硬度值越高,蠕变应力指数越小。Abstract: 2205 duplex stainless steel was welded by continuous drive-rotation friction welding.The microstructure evolutions and the distribution of phase in each joint were observed by optical microscope.Nano-indentation technology was used to evaluate the creep properties of the γ and δ phase.The results show that joint zones,including base metal,welded zone and plastic deformation zone,and nano-hardness in the γ phase markedly increases due to the plastical deformation,and the increment rate is faster than that in the δ phase zone.Creep properties of γ and δ phase are described in creep stress exponent n based on,creep stress exponent decreases with rising nano-hardness of γ and δ phase.
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Keywords:
- 2205 duplex stainless steel /
- friction welding /
- nano-indentation /
- creep
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