Jin Dan;Li Hongquan;Wang Longxiang;

• 1:School of Mechanical and Power Engineering
• 2: Shenyang University of Chemical Technology

Abstract：

Haynes230 nickel-based superalloy is widely used in aerospace, chemical, and nuclear energy fields due to its excellent-high temperature strength and oxidation resistance. The structural failure resulting from creep damage can often be observed in engineering applications. Thus, it is important to predict the creep behavior of materials accurately at high temperatures for engineering. Creep experiments and scanning electron microscope(SEM) experiments for different stresses were conducted on Haynes230 nickel-based alloy at 700 ℃. The secondary development based on Wilshire-Cao-Sinh(WCS) model was carried out by Abaqus software. The experimental results showed that the fracture time gradually decreased with increasing stress and the creep fracture time at 160,180,200,220, and 240 MPa were 57.47, 19.85, 9.78, 5.05, and 2.59 h, respectively. The whole creep process for 5 stresses could be divided into three stages according to the creep strain rate. During the initial creep stage, the creep strain rate decreased gradually and it could be attributed to the material properties improved by work hardening. However, this stage accounted for only 1.3%, 1.2%, 1.4%, 2.0%, and 3.2% of the whole creep process. Subsequently, the steady-state creep stage began. The work hardening, recovery, and recrystallization for this material occurred simultaneously in this stage and no further work hardening was observed. So, the constant creep strain rates, 1.42×10~(-3), 3.23×10~(-3), 7.27×10~(-3), 1.41×10~(-2), and 3.02×10~(-2) h~(-1), were gained from 160 to 240 MPa, respectively. The ratios of this stage in the whole creep process decreased with increasing stress, accounting for 94.8%, 83.5%, 83.1%, 76.8%, and 71.7%, respectively. During the accelerated creep stage, the creep strain rate increased rapidly due to the decrease of effective cross-sectional area. The creep strain rates at fracture were 16.1, 15.2, 16.6, 27.0, and 52.9 h~(-1), respectively. The SEM results showed that a mixed fracture mechanism involving both intergranular brittle fracture and transgranular fracture was shown for 5 stresses. The stress concentration due to the presence of carbides led to the formation and propagation of the micron-sized spherical voids in the edge region. The simulations of creep processes were done by Abaqus software. The simulations showed that three stages during the whole creep process cannot be accurately described based on the time-hardening model. A constant creep strain rate could be obtained for the whole process and the accelerated creep stage cannot be shown. The simulation errors of the creep fracture time were 72.5%, 71.2%, 64.8%, 58.0%, and 57.3%, respectively for 5 stresses. WCS model, involving the creep strain rate, damage evolution rate, and characteristic time, was proposed based on continuum damage mechanics and it could consider the influence of microdamage on the macroscopic mechanical properties of materials. So WCS model was chosen as the creep constitutive relationship for secondary development. The model parameters were determined on the experiment results. The equivalent stress was calculated after declaring the parameters the damage variable,and cumulative strain. The stress was updated based on the strain increment and constitutive relation of WCS model. The creep damage increment within an individual step was calculated and the damage increments were accumulated. The material failed when the damage value reached 1. The simulations after secondary development showed that the strain errors during the steady-state stage for 5 stresses were only 2.3%, 2.4%, 2.7%, 3.3%, and 3.3%, respectively. The maximum error of the creep fracture time between simulations and experimental results was only 2.7%. The results in this paper could provide a basic reference for the research on the creep characteristics at high-temperature for Haynes230 nickel-based superalloy.

Key Words： Haynes230 nickel-based alloy;creep strain rate;finite element simulation;Wilshire-Cao-Sinh(WCS) model;secondary development

Abstract:

Keywords:

Foundation: 国家自然科学基金青年基金项目（11102119）;; 辽宁省教育厅项目（LJKZ0437）资助

Authors: Jin Dan;Li Hongquan;Wang Longxiang;

DOI: 10.13373/j.cnki.cjrm.XY25070011

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