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材料导报  2021, Vol. 35 Issue (z2): 385-390    
  金属与金属基复合材料 |
粉末高温合金夹杂物引起疲劳裂纹萌生微观机理研究现状
刘佳宾, 刘新灵, 李振
北京航空材料研究院,北京 100095
Research Status of Micro-mechanism of Fatigue Crack Initiation Caused by Inclusions in Powder Superalloy
LIU Jiabin, LIU Xinling, LI Zhen
Beijing Institute of Aviation Materials Research, Beijing 100095, China
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摘要 随着航空发动机的发展,对核心耐热部件涡轮盘的服役要求不断提高,镍基粉末高温合金已经成为涡轮盘的首选材料。目前在制备粉末高温合金涡轮盘时不可避免地会引入夹杂物缺陷,夹杂物的存在会导致合金的力学性能,尤其是低周疲劳性能明显降低。为建立带缺陷的粉末高温合金疲劳寿命模型,研究合金中夹杂物的开裂和萌生机理就显得十分必要。   国内外学者对合金中夹杂物的成分、形状、位置、尺寸及自身特性等对疲劳性能的影响做了大量研究,并取得了一定的进展,在细观力学的尺度上解释了各种夹杂物的疲劳开裂模式机理;近年来一些学者采用先进的检测手段,从位错、残余应力和应变能等微观力学角度,对夹杂物的开裂机理进行解释。本文首先明确了粉末高温合金中夹杂物的分类、来源等问题,之后介绍了粉末高温合金疲劳寿命预测的研究方法和模型,结合目前存在的问题,指出夹杂物开裂机理研究是建立可靠粉末高温合金疲劳寿命预测模型的关键。   同时思考了夹杂物导致裂纹萌生的研究目前所存在的问题,指出在研究裂纹萌生机理时,应将多尺度上的表征和特性进行联系,在微观-细观-宏观三种尺度上分析裂纹萌生过程中相互的响应关系,从而为建立考虑缺陷的粉末高温合金疲劳裂纹萌生寿命方法奠定基础。
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刘佳宾
刘新灵
李振
关键词:  粉末高温合金  夹杂物  疲劳  微观机理    
Abstract: With the development of aero-engine, the service requirements of turbine disk, the core heat-resistant component, are increasing, and nic-kel-based powder superalloy has become thefirst choice material for turbine disk. At present, it is inevitable to introduce inclusion defects in the preparation of powder superalloy turbine disk, and the existence of inclusions will lead to the obvious reduction of the mechanical properties of the alloy, especially the low cycle fatigue performance. In order to establish the fatigue life model of powder superalloy with defects, it is necessary to study the cracking and initiation mechanism of inclusions in the alloy. After clarifying the classification and source of inclusions in powder superalloys, scholars at home and abroad have done a lot of research on the influence of composition, shape, position, size and self-characteristics of inclusions on fatigue properties, and made some progress, explaining the fatigue cracking mode mechanism of various inclusions on the scale of micromechanics. In recent years, some scholars have used advanced detection methods to explain the cracking mechanism of inclusions from themicromechanical angles of dislocation, residual stress and strain energy. Then, the research method and model of fatigue life prediction of powder superalloy are introduced. Combined with the existing problems, it is pointed out that the study of inclusion cracking mechanism is the key to establishing a reliable fatigue life prediction model of powder superalloy. The existing problems in the research of crack initiation caused by inclusions are considered, and it is pointed out that when studying the crack initiation mechanism, the multi-scale characterization and characteristics should be linked, and the mutual response relationship in the crack initiation process should be analyzed on the micro-meso-macro scale, thus laying a foundation for establishing the fatigue crack initiation life method of powder superalloy considering defects.
Key words:  powder superalloy    inclusion    fatigue    microscopic mechanism
                    发布日期:  2021-12-09
ZTFLH:  TB-31  
基金资助: 航空发动机及燃气轮机重大专项基础研究(2017-Ⅳ-0004-0041)
通讯作者:  liuxinling119@163.com   
作者简介:  刘佳宾,2019年6月毕业于哈尔滨工程大学,获工学学士学位。现为中国航发北京航空材料研究院硕士研究生,在刘新灵研究员指导下进行研究。目前主要研究领域为金属材料失效分析及断裂损伤机理。
刘新灵,女,博导,研究员。获省部级奖4项,发表文章50篇左右,第一作者著作3部,《疲劳断口定量分析》获国防工业出版社出版基金资助出版。中国机械工程学会失效分析分会委员;中航工业失效分析人员资格鉴定委员会委员,《失效分析与预防》杂志副主编。负责973、国家863、两机专项、国防技术基础等多项科研项目。主要从事失效分析与预防、寿命预测与安全评估、疲劳断口定量分析、失效分析专家系统和先进高温合金材料损伤行为研究。
引用本文:    
刘佳宾, 刘新灵, 李振. 粉末高温合金夹杂物引起疲劳裂纹萌生微观机理研究现状[J]. 材料导报, 2021, 35(z2): 385-390.
LIU Jiabin, LIU Xinling, LI Zhen. Research Status of Micro-mechanism of Fatigue Crack Initiation Caused by Inclusions in Powder Superalloy. Materials Reports, 2021, 35(z2): 385-390.
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http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2021/V35/Iz2/385
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