|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Oil and Gas and AMREE Oil & Gas III
||Effect of Residual Stress on Aging Precipitation Behavior of Oil-grade Alloy 718
||Zhongnan Bi, Hailong Qin, Jinhui Du, Ji Zhang
|On-Site Speaker (Planned)
In the present study, the effect of residual stress on aging precipitation behavior of oil-grade alloy 718 has been investigated. The external stresses, from -300MPa to 300MPa, is applied to solid solution specimens for simulating the effect of residual stress at the aging temperature of 790℃ for 8h. Furthermore, a φ220mm forging, containing quenched-in residual stress, is subjected to an 790℃ aging treatment. Microstructure observation, tensile test and hardness test are used for the investigation. The results show that the precipitation of the γ’’ phase is promoted by residual stress (tensile or compressive stress), and δ phase can also be observed when the stress is big enough after standard heat treatment. The strength and hardness of the material are affected by residual stress due to their influence on precipitations.
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