Effect of ultrasonic nanocrystal surface modification on elevated temperature residual stress, microstructure, and fatigue behavior of ATI 718Plus alloy

被引:42
作者
Kattoura, Micheal [1 ]
Mannava, Seetha Ramaiah [1 ]
Qian, Dong [2 ]
Vasudevan, Vijay K. [1 ]
机构
[1] Univ Cincinnati, Dept Mech & Mat Engn, Cincinnati, OH 45221 USA
[2] Univ Texas Dallas, Dept Mech Engn, Richardson, TX 75080 USA
基金
美国国家科学基金会;
关键词
Ultrasonic Nanocrystal Surface Modification (UNSM); Nickel-based superalloys; High temperature fatigue; Residual stresses; Electron microscopy; STAINLESS-STEEL; LASER; RELAXATION; RESISTANCE; STABILITY; MECHANISM; STRAIN;
D O I
10.1016/j.ijfatigue.2018.01.017
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Ultrasonic Nanocrystal Surface Modification (UNSM) is a mechanical surface treatment that induces large compressive residual stresses and near-surface microstructural changes in the material by using repetitive impacts at ultrasonic frequencies with a WC tip. In this study, we investigate the use of UNSM to improve the fatigue life of ATI 718 Plus (718Plus) at high temperature of 650 degrees C. UNSM induced severe surface plastic deformation which led to nano-sized crystallites, twins, and high dislocation density in the near surface regions, coupled with an increase in surface hardness and high magnitude of compressive residual stresses. This change in the near-surface microstructure remained stable at elevated temperatures. In addition, UNSM retained similar to - 680 MPa near-surface residual stress (56% of its initial residual stress) even after 140 h exposure to 650 degrees C. The retained near-surface residual stresses and the stable microstructure from the UNSM increased the yield strength by similar to 11% (similar to 105 MPa) and endurance limit by similar to 8% (similar to 70 MPa) in corresponding tests at 650 degrees C. This improvement in fatigue life was attributed to near-surface microstructure changes, material hardening and high compressive residual stress induced by UNSM. The estimated crack growth rates were similar to 60% lower for UNSM-treated 718Plus as compared with untreated material. The thermal-mechanical residual stress relaxation indicates the effectiveness of UNSM in improving the fatigue life of 718Plus at 650 degrees C.
引用
收藏
页码:186 / 196
页数:11
相关论文
共 71 条
  • [1] Allegheny Technologies Incorporated, 2013, ATI 718PLUS TECHN DA, V1
  • [2] An in situ transmission electron microscope study of the thermal stability of near-surface microstructures induced by deep rolling and laser-shock peening
    Altenberger, I
    Stach, EA
    Liu, G
    Nalla, RK
    Ritchie, RO
    [J]. SCRIPTA MATERIALIA, 2003, 48 (12) : 1593 - 1598
  • [3] On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti-6Al-4V at elevated temperatures up to 550°C
    Altenberger, Igor
    Nalla, Ravi K.
    Sano, Yuji
    Wagner, Lothar
    Ritchie, Robert O.
    [J]. INTERNATIONAL JOURNAL OF FATIGUE, 2012, 44 : 292 - 302
  • [4] Ultrasonic fatigue performance of high temperature structural material Inconel 718 alloys at high temperature after UNSM treatment
    Amanov, A.
    Pyun, Y. -S.
    Kim, J. -H.
    Suh, C. -M.
    Cho, I. -S.
    Kim, H. -D.
    Wang, Q.
    Khan, M. K.
    [J]. FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 2015, 38 (11) : 1266 - 1273
  • [5] Current theoretical approaches to collective behavior of dislocations
    Ananthakrishna, G.
    [J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2007, 440 (4-6): : 113 - 259
  • [6] Andrieu E., 2015, AEROSPACELAB J, P1
  • [7] [Anonymous], 2015, E46615 ASTM
  • [8] [Anonymous], 2009, STANDARD TEST METHOD
  • [9] ASTM Standard Test Method for Determining the X-Ray Elastic Constants for Use in the Measurement of Residual Stress Using X-Ray Diffraction Techniques ASTM International, 1998, E142694 ASTM INT
  • [10] ASTM Standard Test Method for Verifying the Alignment of X -Ray Diffraction Instrumentation for Residual Stress Measurement ASTM International, 2010, E91510 ASTM INT