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首页> 外文期刊>International Journal of Fatigue >Effect of high frequency mechanical impact treatment on fatigue strength of welded 1300 MPa yield strength steel
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Effect of high frequency mechanical impact treatment on fatigue strength of welded 1300 MPa yield strength steel

机译：高频机械冲击处理对1300 MPa屈服强度钢焊接疲劳强度的影响

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摘要

High frequency mechanical impact (HFMI) is a recent post weld treatment method which can be employed to increase the fatigue strength of welded components. In this paper the fatigue strength of as-welded and HFMI treated fillet welds in a 1300 MPa yield strength steel was compared. Fatigue testing was done under fully reversed, constant amplitude bending load. Finite element analysis was used to calculate the stress distribution in the weld toe region to permit evaluation of the fatigue data with the effective notch stress approach. As-welded samples showed a mean fatigue strength of 353 MPa and a characteristic fatigue strength of 306 MPa. HFMI treatment increased the mean fatigue strength by 26% and the characteristic fatigue strengths by 3%. The weld toe radii in as-welded condition were large. HFMI only increased the weld toe radii slightly but resulted in a more uniform weld toe geometry along the weld. A depth of indentation in the base metal in the range of 0.15-0.19 mm and a width of indentation in the range of 2.5-3 mm, were achieved. Maximum compressive residual stresses of about 800 MPa in the longitudinal and 250 MPa in the transverse direction were introduced by HFMI treatment, adjacent to the weld toe. The surface hardness was increased in the entire HFMI treated region. It is concluded that the increase in fatigue strength is due to the combined effects of the weld toe geometry modification, increase in surface hardness and creation of compressive residual stresses in the treated region.
机译：高频机械冲击（HFMI）是最近的一种焊接后处理方法，可用于提高焊接部件的疲劳强度。本文比较了1300 MPa屈服强度钢中经焊接和HFMI处理的角焊缝的疲劳强度。在完全反向，恒定振幅的弯曲载荷下进行疲劳测试。使用有限元分析来计算焊趾区域中的应力分布，以允许使用有效的缺口应力方法评估疲劳数据。焊接后样品的平均疲劳强度为353 MPa，特征疲劳强度为306 MPa。 HFMI处理使平均疲劳强度提高了26％，特征疲劳强度提高了3％。焊接后的焊趾半径大。 HFMI仅略微增加了焊趾半径，但导致沿焊缝的焊趾几何形状更加均匀。母材中的压痕深度在0.15-0.19mm的范围内，压痕的宽度在2.5-3mm的范围内。通过HFMI处理，在焊趾附近引入了纵向最大压缩残余应力，横向最大压缩残余应力为800 MPa，横向最大压缩残余应力为250 MPa。在整个HFMI处理区域中，表面硬度增加。结论是，疲劳强度的增加归因于焊趾几何形状改变，表面硬度增加和在处理区域产生压缩残余应力的综合作用。

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