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目的为了获得monel-400合金在高温下的性能和进一步了解monel-400合金高温下的“热脆”现象。方法在Gleeble-1500D热模拟实验机对monel-400合金试样进行了600～1100℃共6个温度点的高温拉伸试验,在扫描电镜下对高温拉伸断口进行扫描。结果得到了材料在预设方案下不同温度点的应力-应变曲线。通过对试验结果分析得出:随着试验温度的提高,材料的抗拉强度不断减小,材料的延伸率和断面收缩率不断提高,其中合金的延伸率和断面收缩率在900℃时达到最大值;在600～800℃温度区间材料塑性急剧下降并发生“热脆”现象;材料在高温下的断裂方式为脆性断裂。结论 monel-400合金的高温力学性能及热脆的分析在其实际应用中有重要的指导作用。
Aim To obtain the performance of monel-400 alloy at elevated temperatures and to further understand the “hot brittleness” of monel-400 alloys at elevated temperatures. Methods High-temperature tensile test was carried out on a monel-400 alloy specimen at 600 ~ 1100 ℃ in a Gleeble-1500D thermal simulation machine. The high-temperature tensile fracture was scanned under a scanning electron microscope. Results The stress-strain curves of materials at different temperature points under the preset solution were obtained. Through the analysis of the test results, it is concluded that with the increase of the test temperature, the tensile strength of the material decreases, the elongation and the reduction of area of the material increase continuously, and the elongation and the reduction of area of the alloy reaches the maximum at 900 ℃ Value. The plasticity of material sharply drops and “hot brittleness” occurs in the temperature range from 600 ℃ to 800 ℃. The fracture mode of the material at high temperature is brittle fracture. Conclusion The high temperature mechanical properties of monel-400 alloy and hot brittle analysis in the practical application of an important guiding role.