镍基合金617B的微观组织与力学性能（英文）

发布时间：2018-02-04 03:55

本文关键词： B镍基合金微观组织时效析出硬度韧性拉伸性能　出处：《Transactions of Nonferrous Metals Society of China》2015年04期 　论文类型：期刊论文

【摘要】：采用SEM、TEM和力学性能测试研究镍基合金617B在750°C下时效5000h过程中的微观组织稳定性和力学性能。在时效过程中,合金617B析出M23C6碳化物和γ′相,前者分布于晶界和晶内,后者分布于晶内。随着时效时间的延长,析出物颗粒尺寸逐渐增大。碳化物和γ′相颗粒起到析出强化作用,并提高时效态合金的硬度和强度。在时效过程中,时效态合金的强度和硬度具有良好的稳定性。合金617B时效后的韧性降低是由于γ′相抑制晶界附近的弹性变形,导致晶界裂纹形成;此外,晶界碳化物析出导致其与基体相的界面强度降低,晶界处易产生裂纹。这使得时效态合金的冲击韧性降低。但在时效过程中,时效态合金的韧性具有较好的稳定性是由于时效5000 h过程中析出相的分布未发生明显变化。
[Abstract]:The microstructure and mechanical properties of Ni-based alloy 617B during aging at 750 掳C for 5000h were studied by means of SEM TEM and mechanical properties. Alloy 617B precipitates M23C6 carbide and 纬 'phase, the former distributes in grain boundary and crystal, and the latter distributes in crystal. The particle size of precipitates increases gradually. The carbide and 纬 'phase particles play a role in strengthening precipitation and increasing the hardness and strength of aging alloys. The strength and hardness of the aged alloy have good stability. The decrease of toughness of alloy 617B after aging is due to 纬 'phase restraining elastic deformation near grain boundary and resulting in grain boundary crack formation. In addition, the precipitation of grain boundary carbides leads to the decrease of the interfacial strength between the alloy and the matrix phase, and the formation of cracks at the grain boundary, which reduces the impact toughness of the aging alloy, but during the aging process. The ductile stability of the aging alloy is due to the fact that the distribution of precipitated phase does not change obviously during 5000h aging.
【作者单位】：西安热工研究院有限公司;
【基金】：Project(2012AA050501)supported by the National High-tech Research and Development Program of China Project(NY20110102)supported by the National Energy Applied Technology and Engineering Demonstration Program,China Project(2012CB724401)supported by the National Basic Research Program of China Project(003)supported by CSEE Youth Science & Technology Innovation,China
【分类号】：TG146.15
【正文快照】： 1 IntroductionThe efficient ultra supercritical(USC)power plants,operating at steam temperatures of approximately 600°Cand operating pressures of 25-30 MPa,use high-strengthferritic and austenitic steels(e.g.P92,TP347HFG,Super304,TP310HNb N)for boiler a

【参考文献】