不同层错能镍基合金梯度结构的构筑与组织演变  

Architecture and Microstructure Evolution of Gradient Structured Nickel Based Alloy with Different Stacking Fault Energies

作　　者：马元俊 丁雨田[1,2] 闫康 高钰璧 陈建军 王兴茂 Ma Yuanjun;Ding Yutian;Yan Kang;Gao Yubi;Chen Jianjun;Wang Xingmao(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]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,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《稀有金属材料与工程》2022年第9期3289-3296,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2017YFA0700703);国家自然科学基金(51661019);甘肃省科技重大专项(145RTSA004);兰州理工大学红柳一流学科建设计划。

摘　　要：以Inconel625合金作为参照对象,基于界面调控的合金设计思路,采用热力学软件设计出一种低合金化低层错能的镍基变形高温合金。通过表面机械碾压处理(SMGT)技术,研究层错能对镍基合金梯度结构的演化机制和晶粒细化机制的影响规律。结果表明,经SMGT处理在Inconel 625合金、M1和M2合金表层中分别制备出了450、300和250μm厚的梯度结构层。此外,不同合金梯度组织的演化机制也不同,在Inconel 625合金中,随着应变的逐渐增加,其微观结构细化机制逐步从位错分割机制转变为剪切带和孪晶分割机制;而在M合金中,以形变孪晶分割机制为主。因此,基于设计理念及对应的组织演变机制,可为低层错能镍基变形高温合金的成分设计提供一定的参考。Using Inconel 625 alloy as a reference object,based on the alloy design ideas of interface control,a model alloy with lower stacking fault energy was designed by Thermodynamic software.The influence of stacking fault energy on the evolution mechanism and grain refinement mechanism of nickel-based alloy with gradient structure was studied by surface mechanical grinding treatment(SMGT)technology.The results show that 450,300 and 250 μm thick gradient structure layers were prepared in Inconel 625 alloy M1 and M2alloys by SMGT,respectively.Moreover,the evolution mechanism of the gradient structure of different alloys is also different.For the Inconel 625 alloy,with the gradual increase of strain,its microstructure refinement mechanism gradually change s from dislocation segmentation mechanism to shear band and/or twin segmentation mechanism.However,for the M alloy,the deformation twin split ting mechanism is dominant.Therefore,the design concept and the corresponding mic rostructure evolution mechanism can provide a reference for the composition design of low stacking fault energy nickel base wrought superalloy.

关 键 词：镍基合金 层错能 梯度结构 组织演变 晶粒细化机制 

分 类 号：TG146.15[一般工业技术—材料科学与工程]