Creep residual life prediction of DD6 single crystal superalloy considering microstructure evolution
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摘要:
以DD6单晶高温合金为研究对象,通过描述微观组织演化现象分析材料位错运动硬化机制,建立考虑微观组织演化的多尺度蠕变本构模型;并通过表征蠕变损伤状态,提出考虑蠕变损伤的材料蠕变剩余寿命预测方法。试验结果表明:该蠕变模型比
θ 映射模型模拟精度提高了57.6%,模型参数比K-R损伤模型减少了1/3;基于蠕变剩余寿命模型的预测结果的平均预测误差为5.59%,说明模型的有效性。Abstract:DD6 single crystal superalloy was taken as the research object to analyse the hardening mechanism of material dislocation movement by describing the microstructure evolution phenomenon, and a multi-scale creep constitutive model considering microstructure evolution was established; then a creep residual life prediction method considering the creep damage by characterizing the creep damage state was proposed. The experimental results showed that the creep model improved the simulation accuracy by 57.6% compared with the
θ projection method, and the model parameters were reduced by 1/3 compared with the K-R damage model. The average prediction error of the creep residual life model prediction results was only 5.59%, indicating the validity of the model.-
Key words:
- DD6 single crystal superalloy /
- creep /
- constitutive model /
- microstructure evolution /
- residual life
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表 1 蠕变本构模型参数
Table 1. Parameters of creep constitutive models
模型 参数 数值 粗化模型 ${\lambda _0}$/μm 0.518 $B$/10−6 (μm3/h) 2.579 $Q$/(kJ/mol) 268 筏化模型 $A'$ 39.7354 $n'$ 1.52 流动法则 $K$/MPa 1000 (980 ℃)93( 1100 ℃)$n'$ 5.8(980 ℃) 10.6( 1100 ℃)位错硬化 $q$/GPa 3000 (980 ℃)1000 (1100 ℃)$k$ 2000(980 ℃) 1710 (1100 ℃)位错绕越 $b$/nm 0.255 ${G_s}$/GPa 114 $\theta $ 0.200(980 ℃) 0.145( 1100 ℃)$\kappa $ 2 γ′相剪切 $w$ 1.31(980 ℃) 0.80( 1100 ℃)$ {\gamma _{{\rm{APB}}}} $/(J/m2) 0.1 蠕变损伤 ${\dot d_0}$ 0.90(980 ℃) 0.27( 1100 ℃)$\chi $ 1.88(980 ℃) 2.50( 1100 ℃)$\phi $ 0.5(980 ℃) 0.33( 1100 ℃)$ {\tau _{\rm{c}}} $/MPa 277.6(980 ℃) 157.2( 1100 ℃)$\beta $ 2.5 表 2 蠕变剩余寿命预测精度分析
Table 2. Accuracy of creep residual life prediction
项目 r2 残差
平方和/10−4试验
结果/h模型
预测值/h误差/% 材料1 0.978 7.23 99.9 101.6 1.7 材料2 0.993 1.59 71.5 74.1 3.64 材料3 0.981 5.17 30.6 34.1 11.44 平均 0.984 4.66 5.59 -
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