论文部分内容阅读
采用粉末冶金法制备了不同Zr元素添加量的TZM合金,研究Zr元素的添加量对高温钼合金的显微组织和性能的影响,通过SEM观察了不同Zr元素添加量的合金显微组织;利用EDS对视场中具有特殊形态的物相进行能谱分析和化学成分分析;使用显微硬度测试仪测试了不同Zr元素添加量的合金在室温下的显微硬度,使用Gleeble-1500热模拟试验机测试了不同Zr元素添加量的合金在1300和1400℃时的应力应变曲线。通过显微组织观察发现TZM合金中存在大量的黑色块状第二相,经能谱测定为Ti和Zr的氧化物、单质,它们的存在能有效地阻碍位错的运动,产生强化效果,并在此基础上分析了TZM合金的组织和强化机制。比较了不同Zr添加量的TZM合金在室温下的显微硬度,分析了不同Zr元素添加量的合金在1300和1400℃的应力应变曲线。发现Zr的添加量在0.07%时试样的显微硬度最大,热模拟实验机的数据显示Zr的添加量在0.07%时TZM合金在1300和1400℃变形抗力都最大。
TZM alloys with different Zr additions were prepared by powder metallurgy. The effects of Zr addition on the microstructure and properties of high temperature molybdenum alloys were investigated. The microstructures of alloys with different Zr additions were observed by SEM. EDS was used to conduct the energy spectrum analysis and chemical composition analysis of the phases with special morphology in the field of view. The microhardness of the alloys with different Zr additions was tested at room temperature using a microhardness tester. The Gleeble-1500 thermal simulation The stress-strain curves of the alloys with different Zr additions at 1300 and 1400 ℃ were tested. Through the microstructure observation, it is found that there are a large number of black massive second phase in TZM alloy, which can be determined by energy spectrum as the oxides and simplex of Ti and Zr. Their existence can effectively hinder the movement of dislocation and produce the strengthening effect Based on this, the microstructure and strengthening mechanism of TZM alloy were analyzed. The microhardness of TZM alloy with different Zr additions was compared at room temperature. The stress-strain curves of the alloys with different Zr additions at 1300 and 1400 ℃ were analyzed. It is found that the microhardness of the sample is the largest when the addition amount of Zr is 0.07%. The data of the thermal simulation machine shows that the deformation resistance of the TZM alloy is the highest at 1300 and 1400 ℃ when the addition of Zr is 0.07%.