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一前言高温长时下运行的工程构件在设计中需要各种各样材料的稳态蠕变速度数据,而这一数据受到许多因素的影响,如试验条件之间的差异、不同的数据处理方法引起误差等。本文将讨论人们普遍用来描述稳态蠕变速度的数学表达式和数据处理方法。二数据处理方法 1 稳态蠕变速度稳态蠕变速度是高温长时下运行工程构件设计中的一个重要指标,稳态蠕变速度计算可靠与否对构件的使用寿命影响很大。 1) 蠕变曲线的测定根据GB2039-80,用一个试样在一定的温度和应力下进行蠕变试验,测出其变形量与对应时间的一系列数据,绘出ε-t曲线。图1表示了GH698合金在温度为700℃、应力为42kgf/mm~2下的蠕变曲线。
I. INTRODUCTION Engineering components operating at high temperatures and long hours require steady-state creep velocity data for a wide variety of materials in their design, and this data is influenced by many factors, such as differences in test conditions, different data processing methods Error and so on. This article will discuss mathematical expressions and data processing methods commonly used to describe steady-state creep speeds. Data Processing Method 1 Steady-state creep speed Steady-state creep speed is an important indicator in the design of engineering components running at high temperature for long periods. The reliability of steady-state creep speed calculation has a great influence on the service life of components. 1) Determination of Creep Curves According to GB 2039-80, a sample is subjected to a creep test at a certain temperature and stress to determine a series of data on the amount of deformation and the corresponding time and plot the ε-t curve. Figure 1 shows the creep curves of GH698 alloy at a temperature of 700 ° C and a stress of 42 kgf / mm ~ 2.