Residual Stress Determination of Cast Aluminium Benchmark Components Using Strain Relief Techniques

IF 2 3区 工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Experimental Mechanics Pub Date : 2024-02-21 DOI:10.1007/s11340-024-01033-5
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Abstract

Background

Residual stress development in precipitation strengthened aluminium foundry alloys has seen little attention, despite the prevalence of their use over a wide array of applications.

Objective

This study aims at the evaluation of the residual stress in a cast aluminium benchmark that develops during precipitation heat treatment and determines the preferable stress relaxing techniques for such applications.

Methods

The stress states in the as-cast, T4 and T6 tempers of the same AlSi7Cu0.5Mg (A356 with 0.5 wt% Cu) sample were determined through a novel application of the contour method, standard hole drilling, deep hole drilling and incremental deep hole drilling.

Results

The results of all measurement techniques lie within approximately 40 MPa for all regions available for comparison, with the greatest differences occurring between the contour method and deep hole drilling for the T6 component. It is shown that the peak tensile residual stresses are almost identical between the heat-treated components (75 MPa), but the distribution and magnitude of compressive residual stress are found to be significantly different.

Conclusions

Among the measurement techniques evaluated, the contour method and incremental hole drilling are found to be more suitable for T6 temper, while all techniques perform equally well for T4 temper due to its relatively low strength. It is hypothesised that the difference between the as-cast and heat-treated samples is due to solution heat treatment and quenching, while the difference in T4 and T6 tempers is attributed to the response to ageing.

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利用应变释放技术测定铸铝基准部件的残余应力
摘要 背景 沉淀强化铸造铝合金中残余应力的发展很少受到关注,尽管其在广泛的应用中得到了普遍使用。 本研究旨在评估铸造铝基准在沉淀热处理过程中产生的残余应力,并确定此类应用中可取的应力松弛技术。 方法 通过轮廓法、标准钻孔法、深孔钻孔法和增量深孔钻孔法的新颖应用,确定同一 AlSi7Cu0.5Mg (含 0.5 wt% Cu 的 A356)试样的铸造状态、T4 和 T6 温度下的应力状态。 结果 在所有可比较的区域,所有测量技术的结果都在大约 40 兆帕以内,其中 T6 构件的等高线法和深孔钻法之间的差异最大。结果表明,热处理组件之间的拉伸残余应力峰值几乎相同(75 兆帕),但压缩残余应力的分布和大小有显著差异。 结论 在所评估的测量技术中,轮廓法和增量钻孔法更适用于 T6 回火,而由于 T4 回火的强度相对较低,所有技术在 T4 回火中的表现都一样好。据推测,铸件和热处理样品之间的差异是由于固溶热处理和淬火造成的,而 T4 和 T6 温度之间的差异是由于时效反应造成的。
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来源期刊
Experimental Mechanics
Experimental Mechanics 物理-材料科学:表征与测试
CiteScore
4.40
自引率
16.70%
发文量
111
审稿时长
3 months
期刊介绍: Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.
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