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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis of Hardened Depth Variability, Process Potential, and Measurement Error in Case Carburized Components
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Analysis of Hardened Depth Variability, Process Potential, and Measurement Error in Case Carburized Components

机译：渗碳零件的硬化深度变化，工艺潜力和测量误差分析

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摘要

Hardened depth (effective case depth) measurement is one of the most commonly used methods for carburizing performance evaluation. Variation in direct hardened depth measurements is routinely assumed to represent the heat treat process variation without properly correcting for the large uncertainty frequently observed in industrial laboratory measurements. These measurement uncertainties may also invalidate application of statistical control requirements on hardened depth. Gage R&R studies were conducted at three different laboratories on shallow and deep case carburized components. The primary objectives were to understand the magnitude of the measurement uncertainty and heat treat process variability, and to evaluate practical applicability of statistical control methods to metallurgical quality assessment. It was found that similar to 75% of the overall hardened depth variation is attributed to the measurement error resulting from the accuracy limitation of microhardness equipment and the linear interpolation technique. The measurement error was found to be proportional to the hardened depth magnitude and may reach similar to 0.2 mm uncertainty at 1.3 mm nominal depth and similar to 0.8 mm uncertainty at 3.2mm depth. A case study was discussed to explain a methodology for analyzing a large body of hardened depth information, determination of the measurement error, and calculation of the true heat treat process variation.
机译：硬化深度（有效表面深度）的测量是渗碳性能评估中最常用的方法之一。通常假定直接硬化深度测量值的变化代表热处理过程的变化，而没有适当地校正工业实验室测量中经常观察到的较大不确定性。这些测量不确定性也可能使对硬化深度的统计控制要求的应用无效。在浅层和深层渗碳部件的三个不同实验室进行了量具R＆R研究。主要目标是了解测量不确定度的大小和热处理工艺的可变性，以及评估统计控制方法在冶金质量评估中的实际适用性。已发现，总硬化深度变化的75％类似于归因于显微硬度设备和线性插值技术精度限制的测量误差。发现测量误差与硬化深度的大小成正比，在标称深度为1.3毫米时可能达到与0.2毫米不确定度相似，在标称深度为3.2毫米时可能达到0.8毫米不确定度。讨论了一个案例研究，以解释用于分析大量硬化深度信息，确定测量误差以及计算真实热处理工艺变化的方法。

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