The induction of near-surface compressive residual stress is an important factor for fatigue life improvement of HFMI-treated welded joints. However, the relaxation of these beneficial residual stresses under single overload peaks under variable amplitude and service loads may significantly reduce fatigue life improvement. For this reason, several recommendations exist to limit the maximum applied load stress for this kind of post-treated welded joints. In this work, the effect of single tension and compression overloads on the relaxation behavior of HFMI-induced residual stresses was studied experimentally by means of X-ray and neutron diffraction techniques complemented by numerical simulation at transverse stiffeners made of mild S355J2 steel and high strength S960QL steel. Loads were applied close to the real yield strength of the base material. Significantly different relaxation behavior was observed for S355J2 and S960QL steel. Furthermore, high compression loads lead to full residual stress relaxation at the weld toe of S960QL and moderate relaxation for S355J2. High tension loads lead only to slight relaxation.

中文翻译：

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单个过载峰值后，HFMI处理的角焊缝的残余应力松弛

感应近表面压缩残余应力是改善HFMI处理的焊接接头疲劳寿命的重要因素。但是，在可变振幅和服务负载下的单个过载峰值下，这些有益残余应力的松弛会显着降低疲劳寿命。因此，存在一些建议来限制这种后处理焊接接头的最大施加负载应力。在这项工作中，通过X射线和中子衍射技术，辅以数值模拟，对低碳S355J2钢和高强度钢制成的横向加劲肋，通过实验研究了单次拉伸和压缩过载对HFMI引起的残余应力的松弛行为的影响。 S960QL钢。施加的载荷接近基材的实际屈服强度。对于S355J2和S960QL钢，观察到明显不同的松弛行为。此外，高压缩载荷会导致S960QL焊趾处的残余应力完全释放，而S355J2则出现适度的松弛。高张力载荷只会导致轻微的松弛。