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铁铬铝为基的合金,目前已被广泛地应用作高温应变计的材料。这类合金可以在2。~800℃范围应用。但是,由于化学成分的不同,即铬和铝的含量的不同,显著地影响着高温应变计材料的使用温度范围和加工性能。本文首先简述了合金主要化学成分、合金“纯度”以及其它添加元素对合金加工性的影响效果。对铁铬铝合金而言,如果严格控制温度和加工工艺,含16一27终Cr、4.5一7多Al的合金,能够进行热加工和冷加工;合金的“纯度”对合金的塑性亦产生较大的影响。特别是含碳量增高时,更会使这些合金的热加工和冷加工发生困难。一般应使合金中碳含量小于碳在该合金中的溶解度0 .03一0 .033男;为了改善这类合金的加工性能,添加0.1一0.5终稀土元素是比较有效的;加入0.1一1.0终Y在Fe一C卜Al合金中对抗氧化性有显著提高,并对加工性能有良好的影响;其它Ti、Zr、Be、Mg、Ba等元素也均有不同程度的改善作用。为了探讨铝、钒、忆和稀土元素对合金加工性的影响,我们采用正交设计方案研究了合金元素对抗拉强度和延伸率的影响,提供了通过添加元素改进合金加工性能的重要依据。在工艺上对合金的“纯度”、浇注工艺和热加工工艺采取了改进措施。为了解决冷拉丝材的困难,我们还采用了温拉工艺。温拉加热温度为200~300℃,这是由于在此温度时可以得到较高的塑性而又不致于使合金的强度降低很多,以保证合金在拉丝过程中具备必要的抗拉伸变形的强度。
Iron-chromium aluminum-based alloys, has now been widely used as a high temperature strain gauge material. Such alloys can be 2. ~ 800 ℃ range of applications. However, due to the difference in chemical composition, ie, the content of chromium and aluminum, the temperature range and processability of high-temperature strain gauge material are significantly affected. This article first briefly described the main chemical composition of the alloy, alloy “purity ” and other added elements on the alloy processing effect. For iron-chromium aluminum alloy, if the temperature and processing technology are strictly controlled, the alloy containing 16 to 27 final Cr and 4.5 to more than 7 aluminum can be hot-worked and cold-worked; the plasticity of the alloy Have a greater impact. In particular, when the carbon content is increased, the heat treatment and cold working of these alloys are more difficult. Generally, the carbon content in the alloy should be less than the solubility of carbon in the alloy from 0.033 to 0.033 M. In order to improve the processing performance of the alloy, addition of 0.1 to 0.5 of the final rare earth element is more effective. Adding 0.1 to 1.0 Y in Fe a C BU Al alloy oxidation resistance significantly improved, and the processing performance have a good effect; other Ti, Zr, Be, Mg, Ba and other elements also have different degrees of improvement. In order to investigate the influence of Al, V, Mn and rare earth elements on the workability of alloy, we studied the effect of alloying elements on tensile strength and elongation by orthogonal design and provided an important basis for improving alloy processing performance by adding elements. In the process of alloy “purity ”, pouring process and thermal processing technology to take measures to improve. In order to solve the difficulty of drawing wire, we also use the Wara process. Wenshen heating temperature of 200 ~ 300 ℃, which is because at this temperature can be a high degree of plasticity without causing the strength of the alloy to reduce a lot in order to ensure that the alloy has the necessary tensile strength in the drawing process .