Residual stress characterization in 12%-Cr steel friction stir welds by neutron diffraction
Residual stress characterization in 12%-Cr steel friction stir welds by neutron diffraction
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DOI：
10.1177/0309324712441433
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发表时间：
2012-05-01
影响因子：
1.6
通讯作者：
Korsunsky, Alexander M.
中科院分区：
文献类型：
--
作者：
Jun, Tea-Sung;Hofmann, Felix;Korsunsky, Alexander M.
本文报道了12.7 mm厚12%-Cr钢板搅拌摩擦焊的研究结果。残余应力测量采用角度色散中子衍射法。通过分析衍射峰、峰展宽和作为残余应力源的相关残余应变(本征应变)以及峰位移来评价焊接构件中的残余弹性应变，得到了搅拌摩擦焊试件中三维残余应力状态的完整表征。使用了三种不同的方法来解决确定焊缝上DO变化的关键问题。梳子(或火柴棍)方法与其他两种方法：平衡法和零牵引法进行了比较。研究发现，梳状法和零牵引法的结合可以得到可靠的残余应变/应力分布。
In the present paper we report the results of a study into friction stir welds made in 12.7 mm-thick 12%-Cr steel plates. Residual stress measurements were performed using angle-dispersive neutron diffraction. Complete characterization of the three-dimensional residual stress state in friction stir weld samples was obtained by analysing diffracted peaks; peak broadening for identifying the regions of severe plastic deformation and the associated residual strain (eigenstrain) acting as the source of residual stress and peak shifting for evaluating residual elastic strains in the welded component. Three different methods were used to address the key issue of determining the do variation across the weld. The comb (or matchstick) method was compared with two other approaches: the balance method, and the zero traction method. It was found that a combination of the comb and the zero traction methods allows reliable residual strain/stress distributions.