Residual Stress Evolution during Manufacture of Aerospace Forgings
Residual Stress Evolution during Manufacture of Aerospace Forgings
复制标题
航空航天锻件制造过程中的残余应力演变
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Evans
中科院分区：
文献类型：
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作者：
J. Rolph;M. Preuss;N. Iqbal;M. Hofmann;S. Nikov;M. Hardy;M. Glavicic;R. Ramanathan;A. Evans
采用中子衍射和轮廓法对RR1000小尺度锻件淬火、时效和加工过程中的残余应力进行了实验测量。锻件直径88.9mm，厚度25.450.8mm，具有足够小的几何形状，可以在大部分锻件的3个方向上进行中子应变测量。采用等高线法成功地生成了时效和加工样品的完整二维环向应力图。这两组实验数据吻合得很好。基于实验推导的传热系数（HTC）曲线的有限元建模预测允许进一步的比较和生成额外的数据。实验数据与模拟数据吻合较好，但在轴向上存在一定的差异。水淬过程在环向和径向产生高达1400MPa的峰值应力，随着时效，峰值应力松弛了700MPa。在大多数情况下，通过加工去除材料对残余应力的影响较小，可使残余应力松弛100-200MPa。
The residual stresses present through the quenching, ageing, and machining processes in sub-scale forgings of RR1000 have been measured experimentally using neutron diffraction, and the contour method. The forgings, 88.9mm in diameter, and 25.450.8mm thickness, were of small enough geometry to allow neutron strain measurement in 3 directions throughout most of the bulk. The contour method was employed successfully to generate a full 2D map of the hoop stress in the as-aged and machined samples. The two experimental data sets have been shown to agree very well. Finite element modelling predictions based on an experimentally derived heat transfer coefficient (HTC) curve allowed further comparison and generated additional data. Agreement between the experimental and simulated data was found to be reasonable with some discrepancy visible in the axial direction. The water quenching process was found to generate peak stresses up to 1400MPa in the hoop and radial direction, which were relaxed by as much as 700MPa through ageing. Material removal by machining had a less significant impact in most cases, relaxing residual stress by 100-200MPa.