粉末冶金镍基高温合金车削时表面完整性及其对高温疲劳行为影响的研究

IF 0.6 Q4 ENGINEERING, MECHANICAL
Zheng MA, Jiaqiang DANG, Qi WANG, Weiwei MING, Qinglong AN, Ming CHEN
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引用次数: 0

摘要

FGH96作为最新一代粉末冶金镍基高温合金中的一员,由于其优异的力学性能,已广泛应用于航空发动机的制造中。表面完整性对加工零件的最终疲劳寿命起着至关重要的作用。然而,加工过程中产生的表面改性是不可避免的,它深刻地影响着制造零件在使用寿命期间的高温疲劳行为。为了弥补这一空白,本文专门研究了粉末冶金镍基高温合金在机械车削过程中的表面完整性及其对高温疲劳行为的影响。在不同的输入参数下,初步表征了表面完整性,包括表面形貌、显微硬度和与深度相关的残余应力。然后对加工后的试样进行了高温疲劳试验,以确定其表面完整性与疲劳行为之间的关系。结果表明,输入参数对合金的表面状态和高温疲劳性能影响较大。加工表面完整性差导致疲劳性能差,呈现典型的疲劳断裂形态,包括裂纹萌生、扩展和最终断裂。而加工表面良好的完整性有助于提高疲劳性能。更有趣的是,这种情况下的断裂形态与静态拉伸断裂相似,沿最大剪应力方向呈现剪切破坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
STUDY ON SURFACE INTEGRITY AND ITS INFLUENCE ON HIGH TEMPERATURE FATIGUE BEHAVIOR WHEN TURNING POWDER METALLURGY NI-BASED SUPERALLOY
As a member of the latest generation of powder metallurgy Ni-based superalloy, FGH96 has already been widely applied in the manufacturing of aero-engines because of its distinguished mechanical performances. The surface integrity plays an essential role in the final fatigue life of the machined parts. However, surface modification induced by the machining process is inevitable, which profoundly affects the high temperature fatigue behavior of the manufactured part during the service lifetime. To cover the gap, the present work was carried out to specially study the surface integrity and its influence on high temperature fatigue behavior of powder metallurgy Ni-based superalloy when subjected to the mechanical turning process. The surface integrity, including surface morphology, micro-hardness, and depth-dependent residual stress, was initially characterized under different input parameters. High temperature fatigue tests were then conducted on the processed specimens to correlate the surface integrity and its fatigue behavior. Results showed that input parameters greatly influence the surface condition and thus the high temperature fatigue behavior. Poor integrity on machined surface leads to poor fatigue performance with typical fatigue fracture morphology, including crack initiation, propagation, and final fracture. While fine integrity on machined surface contributes to better fatigue performance. More interestingly, the fracture morphology in this situation shows similarity to the static tensile fracture, which presents shear failure along the direction of maximum shear stress.
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来源期刊
MM Science Journal
MM Science Journal ENGINEERING, MECHANICAL-
CiteScore
1.30
自引率
42.90%
发文量
96
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