Testing and analysis of residual stresses in quenched 7075 aluminum alloy thick plate

QIN Guo-hua; XIN Zhi-wen; LIN Feng; YE Hai-chao; HAN Xiong

doi:10.3788/OPE.20172513.0095

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Testing and analysis of residual stresses in quenched 7075 aluminum alloy thick plate

更新时间：2020-08-13

- Testing and analysis of residual stresses in quenched 7075 aluminum alloy thick plate
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 95-103(2017)
- 作者机构：
  
  1. 南昌航空大学航空制造工程学院,江西南昌,330063
  2. 成都飞机工业(集团)有限责任公司数控加工厂, 四川成都 610092
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172513.0095
  CLC： TG156.3;TP391.9
- Received：15 May 2017，
  
  Revised：06 July 2017，
  
  Published：25 November 2017
- 稿件说明：
移动端阅览
秦国华, 辛志文, 林锋等. 7075铝合金厚板淬火残余应力的测试与分析[J]. 光学精密工程, 2017,25(10s): 95-103

QIN Guo-hua, XIN Zhi-wen, LIN Feng etc. Testing and analysis of residual stresses in quenched 7075 aluminum alloy thick plate[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 95-103
秦国华, 辛志文, 林锋等. 7075铝合金厚板淬火残余应力的测试与分析[J]. 光学精密工程, 2017,25(10s): 95-103 DOI： 10.3788/OPE.20172513.0095.

QIN Guo-hua, XIN Zhi-wen, LIN Feng etc. Testing and analysis of residual stresses in quenched 7075 aluminum alloy thick plate[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 95-103 DOI： 10.3788/OPE.20172513.0095.

摘要

对7075铝合金厚板进行固溶处理，研究不同厚度的板材在相同介质中进行喷淋淬火和浸没淬火所产生的残余应力水平。首先对喷淋与浸没淬火过程进行有限元建模与计算，通过盲孔法和裂纹柔度法进行残余应力测试，对比分析后认为：残余应力的分布趋势，仿真值与实验结果较为吻合。其次，通过研究厚向残余应力的分布状态，分析不同厚度铝厚板喷淋淬火和浸没淬火的工艺差异，结果表明：淬火冷却速度和板材厚度是影响淬火后残余应力的关键因素，浸没淬火残余应力在板厚70 mm后无明显增幅，而喷淋淬火增幅比较均匀，淬火冷却速度越大残余应力越大；板厚在30 mm以下采用喷淋淬火产生的残余应力很小，几乎为零，而板厚从30 mm增加到100 mm过程中，喷淋淬火引起的表层压应力减小的幅度较心部拉应力要快，30到60 mm之间心部拉应力的降幅不明显，并且两者之间的差异越来越小，呈下降趋势；喷淋淬火与浸没淬火的优劣性随着厚度的增加逐渐缩小。

Abstract

After solution treatment of 7075 aluminum alloy plates

the residual stresses were respectively investigated in the processes of spraying quenching and immersion quenching with the same medium. Firstly

the finite element model was established for the spray-and immersion-quenching. The blind-hole method and crack compliance method were respectively adopted to measure the residual stresses

thus validating the FEM of quenching processes. The comparison analysis show that the simulated values of the residual stress distribution are in good agreement with the experimental measurement data. Secondly

the influence of plate thickness on the residual stress distribution was revealed for the spray quenching and immersion quenching. Obviously

the quenching cooling rate and plate thickness are critical to residual stresses. The residual stress remains unchanged when the plate thickness is more than 70 mm in the immersion quenching. However

the spray quenching can make the residual stress increase uniformly. In addition

the residual stress can increase with the increment of cooling rate. The residual stress in plates with thickness less than 30 mm is small. The surface compressive stresses

induced by the spray quenching

decrease faster than the interior tensile stresses when the plate thickness varies from 30 mm to 100 mm. Nevertheless the interior tensile stress decreased rarely if the plate thickness is from 30 mm to 60 mm. The difference between spraying quenching and immersion quenching gets smaller and smaller. Moreover

the advantage of spray quenching on immersion quenching is gradually decreased with the increase of plate thickness.

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Keywords

references

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