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首页> 外文期刊>Materials Science and Engineering >Effect of solution heat treatment on residual stress in Al alloy engine blocks using neutron diffraction
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Effect of solution heat treatment on residual stress in Al alloy engine blocks using neutron diffraction

机译：固溶热处理对中子衍射铝合金发动机缸体残余应力的影响

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摘要

Tensile residual stress in the cylinder bore region is a significant problem associated with Al engine blocks containing cast-in gray iron cylinder liners as it can result in cylinder distortion or engine block fracture. These issues can lead to significant environmental (emissions) and economic (recalls) problems for automotive OEMs. In this study, in-situ and ex-situ neutron diffraction was used to measure the change in residual strain in the cylinder bridge as a function of time during solution heat treatment and map to the stress profiles following heat treatment. A heating system, consisting of coiled tubular heaters in the cylinder bores and strip heaters along the front and side faces of the engine block, was designed and built to heat the blocks to the solution temperatures The results indicated that solutionizing at 470 ℃ caused a gradual relief of tensile residual strain up to approximately 5 h, where strain was completely relieved. At 500 ℃, the strain relieved more rapidly, which resulted in complete relief in under 0.5 h. Cooling to ambient temperature caused the partial re-development of tensile residual stress throughout the cylinder depth due to thermo-mechanical mismatch, however the magnitude was lower than for the as-cast condition.
机译：汽缸孔区域中的拉伸残余应力是与包含铸铁灰铁缸套的Al发动机缸体相关的重要问题，因为它可能导致缸体变形或发动机缸体破裂。这些问题可能导致汽车OEM严重的环境（排放）和经济（召回）问题。在这项研究中，原位和异位中子衍射用于测量固溶热处理过程中圆柱桥残余应变随时间的变化，并映射到热处理后的应力分布。设计并制造了一个加热系统，该系统由汽缸膛中的盘管式加热器和沿发动机缸体的正面和侧面形成的带状加热器组成，用于将缸体加热至固溶温度。结果表明，在470℃固溶会逐渐产生残余残余应力的释放可长达约5小时，此时应变已完全消除。在500℃时，应变更快地释放，在0.5h内完全释放。由于热力机械失配，冷却至环境温度会导致整个气缸深度的拉伸残余应力部分重新产生，但是其强度低于铸态条件。

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