丁雨田,孟斌,高钰璧,马元俊,许佳玉,陈建军.过温服役条件下GH3625合金组织稳定性研究[J].稀有金属材料与工程,2019,48(5):1605~1614.[Ding Yutian,Meng bin,Gao Yubi,Ma Yuanjun,Xu Jiayu,Chen Jianjun.Study on Microstructure Stability of GH3625 Alloy during Over-temperature Service[J].Rare Metal Materials and Engineering,2019,48(5):1605~1614.]
过温服役条件下GH3625合金组织稳定性研究
投稿时间:2017-12-22  修订日期:2018-03-21
中文关键词:  固溶态GH3625合金  相转变  混晶组织  晶界宽化  断裂模式
基金项目:甘肃省重大科技专项资助 (项目号145RTSA004);国家自然科学基金(项目号 51661019)
中文摘要:
      采用SEM、EDS、XRD、万能拉伸试验机等手段,研究了750 ℃时效不同时间对GH3625合金管材组织及力学性能的影响。结果表明:固溶态的GH3625合金在750 ℃时效1000 h后主要析出MC、M6C、M23C6、??、?相。GH3625合金时效过程中的晶粒长大和晶界处相变行为以及Nb原子的溶质拖曳作用有密切的关系。固溶态的GH3625合金在750 ℃时效(0~1000 h范围内)后晶界宽度呈现出先增后减的趋势。GH3625合金时效前后,抗拉强度变化并不明显,屈服强度呈现出持续升高的趋势,但是合金的伸长率损失了62.55%,断裂模式从延性断裂转变为脆性断裂。
Study on Microstructure Stability of GH3625 Alloy during Over-temperature Service
英文关键词:Solid solution state of GH3625 alloy  phase transition mixed  grain structure  grain-boundary coarsening  fracture mode
英文摘要:
      The influence of different aging time at 750 ℃ on microstructure and mechanical properties of GH3625 alloy tube were investigated by means of OM, SEM, EDS, Universal Testing Machine and other means in this work. The results show that the MC, M6C, M23C6, ?? and ? phase are mainly precipitated in the GH3625 alloy at 750 ℃ for 1000 h. The grain growth in the aging process of GH3625 alloy is closely related to the phase transition behavior at the grain boundary and the solute drag of Nb atoms. Due to the transformation of different types of the phase at the grain boundaries, the grain boundaries width of the GH3625 alloy with increases initially and then decreases during the long-term heat preservation at 750 ℃. Before and after aging, the change of tensile strength of the alloy is not obvious, and the yield strength of alloy shows a trend of increasing continuously. However, the elongation of the alloy has lost by 62.55%, and the fracture mode changes from ductile fracture to brittle fracture.
作者单位E-mail
丁雨田 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 dingyutian @126.com 
孟斌 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 mengbin1219@126.com 
高钰璧 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
马元俊 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
许佳玉 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
陈建军 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室  
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