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本文介绍了一种新型的应用于测量高温部降应力分析为高温应变合金。这种合金能承受700℃的高温。用它制成的高温应变片,为肮空发动机涡轮盘、涡轮叶片、燃气导管、加力筒体等部件的高温应力分布的实测与判断,提供了可靠的数据。该合金为铁基合金。并添加了适量的铬、铝、钒、稀土。通过真空中频熔炼及选择合理的加工方法将合金拉拔成功0.03mm。丝材的最终热处理包括用保护气氛连续淬火和用专门的予氧化处理工艺加以保证,在合适的温度和时间的处理制度下,可获得优良的性能。材料的主要性能包括电阻率、电阻温度系数及其分散度,高温零漂及高温循环重复性。其中电阻温度系数可以通过平衡电桥的方法在函数记录仪中描绘其电阻一温度曲线。其数值可以用标准电阻箱预先进行校正,最后用应变仪进行精密测试。对于可疑数据可用数据处理方法剔除。文中最后部分对电阻一温度反常现象,试件膨胀系数对丝材的性能的影响和能否通过合金元素的控制以获得较佳的电阻稳定性进行了初步探讨。
This article describes a new type of high-temperature strain gauge alloy used for the measurement of high-temperature stress. This alloy can withstand 700 ℃ high temperature. The high temperature strain gauge made of it provides reliable data for the measurement and judgment of the high temperature stress distribution of the components such as the turbine disc, the turbine blade, the gas pipe and the cylinder of the hollow engine. The alloy is an iron-based alloy. And add the right amount of chromium, aluminum, vanadium, rare earth. Through vacuum IF melting and choose a reasonable method of drawing the successful 0.03mm alloy. The final heat treatment of the wire includes continuous quenching with a protective atmosphere and the use of a special preoxidation process to ensure good performance under the proper temperature and time handling regime. The main properties of the material, including resistivity, temperature coefficient of resistance and dispersion, high temperature zero drift and high temperature cycling repeatability. The temperature coefficient of resistance can be bridged by the method of balancing the function of the recorder depicting the resistance of a temperature curve. Its value can be calibrated in advance with a standard resistance box, and finally with a strain gauge for precision testing. For suspicious data can be removed using data processing methods. The last part of the article on the resistance of a temperature anomaly, the expansion coefficient of the specimen on the performance of the wire and can be controlled by alloying elements to obtain better resistance stability was discussed.