Ni3Al基单晶合金IC21的微观组织及力学性能
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ni3Al-BASED SINGLE CRYSTSAL ALLOY IC21
Online published: 2015-09-08
Supported by
Supported by National Natural Science Foundation of China (No.51371014) and Joint Funds of National Natural Science Foundation of China (No.U1435207)
针对高压涡轮导向叶片服役性能需求特点研发了一种低密度、低成本、高强度Ni3Al基单晶合金IC21. 该合金的Re含量不大于1.5%, 密度小于8.0 g/cm3. 金相法测得合金的初熔温度约为1345 ℃. 经过标准热处理后, IC21合金中g'相分布均匀, 体积分数为80%左右, 尺寸约为420 nm, 具有较高的g'相立方化程度和排列有序度. IC21单晶合金在1100 ℃下抗拉强度为490 MPa, 屈服强度为470 MPa, 在1100 ℃, 140 MPa条件下的持久寿命可达170.5 h, 1150 ℃, 100 MPa条件下的持久寿命可达110.0 h. IC21单晶合金具有良好的高温组织稳定性和较好的抗高温氧化性, 1080 ℃长期热暴露后, 没有拓扑密堆相析出, 在1100 和1150 ℃大气中100 h的氧化动力学曲线遵循抛物线规律, 氧化增重速率分别为0.015和0.045 mg/(cm2h). 组织结构分析表明, 该单晶合金的高温强度主要来源于高的g'相含量、高的合金错配度和致密的界面位错网结构.
赵海根,李树索,裴延玲,宫声凯,徐惠彬 . Ni3Al基单晶合金IC21的微观组织及力学性能[J]. 金属学报, 2015 , 51(10) : 1279 -1287 . DOI: 10.11900/0412.1961.2015.00434
According to the requirement of high-pressure turbine guide vane during service, the aim of this work is to design a single crystal Ni3Al-based alloy named IC21 with low density, low cost, and high strength which can be used as high-pressure turbine guide vane material. The mass fraction of the Re has been limited less than 1.5% on purpose. The single crystal bars of IC21 were prepared by high rate solidification method. The density of IC21 is 8.0 g/cm3 and the incipient melting temperature was identified by metallography. After standard heat treatment, the distribution of the g' precipitates is uniform with the average size of about 420 nm, and volume fraction of 80%. The tensile and yield strengths at 1100 ℃ are 490 and 470 MPa, respectively. Moreover, IC21 shows superior creep properties, the stress-rupture life at 1100 ℃,140 MPa is 170.5 h and at 1150 ℃,100 MPa still remains 110.0 h. The microstructure stability of IC21 alloy at 1080 ℃ for as long as 1000 h were evaluated. The results show that no precipitated phase exists during thermal exposure at 1080 ℃, which exhibits good stability. The oxidation kinetic curves of IC21 alloy follows a parabolic rate law in different oxidation stage during cycle oxidation for 100 h in air. IC21 alloy has a good high temperature oxidation resistance, the strengthening mechanism are attributed to high volume fraction of g' phase, large negative misfit and well-established interface networks.
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