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Constitutive modeling of the creep behavior of single crystal superalloys under non-isothermal conditions inducing phase transformations

机译：非等温条件下引起相变的单晶高温合金蠕变行为的本构模型

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The prediction of the viscoplastic behavior of Ni-based single crystal superalloy is still a challenging issue due to the non-isothermal loadings which can be encountered by aeronautical engines components such as high pressure turbine blades. Under particular in-service conditions, these materials may experience temperature cycles which promote the dissolution of the strengthening γ' phase of the material on (over)heating, and subsequent precipitation on cooling, leading to a transient viscoplastic behavior.rnNew internal variables representing the microstructural changes under those specific thermal loadings have been introduced in the framework of crystal plasticity using a macroscopic approach (no representation of the γ/γ microstructure of the alloy) to account for the transient creep behavior induced by microstructure changes. This modeling approach captures first order effects on the creep behavior due to (a) γ' precipitates volume fraction evolution of each kind of particles of a bimodal distribution of precipitates (which evolves according to thermal history), (b) recovery of the dislocation density and, (c) material orientation.rnIn addition, a damage law keeping in memory all the thermal history and recovery processes has been introduced to account for the unconventional post-overheating creep life.rnThis model is calibrated on non-isothermal creep experiments on [0 01 ] oriented single crystals made of MC2 alloy. It is able to predict creep strain (primary, secondary, tertiary), whatever the temperature history of the material. In addition, it can be used to quantify the effect of slight variation of the as-received γ' volume fraction on the creep behavior.
机译：由于航空发动机部件（例如高压涡轮叶片）可能会遇到非等温载荷，因此对镍基单晶高温合金的粘塑性行为的预测仍然是一个具有挑战性的问题。在特定的使用条件下，这些材料可能会经历温度循环，这些温度循环会在（过热）加热时促进材料的强化γ'相溶解，并在冷却时随后析出，从而导致瞬态粘塑性行为。在微观塑性变化的框架内，已经采用宏观方法（没有代表合金的γ/γ微观结构）引入了那些特定热负荷下的微观结构变化，以说明微观结构变化引起的瞬态蠕变行为。这种建模方法捕获了由于（a）γ'沉淀物双峰分布的每种颗粒的体积分数演化（根据热历史而演变）引起的对蠕变行为的一级影响，（b）位错密度的恢复此外，已经引入了一个破坏规律，将所有的热历史和恢复过程都存储在内存中，以说明非常规的过热后蠕变寿命。rn该模型在[由MC2合金制成的0 01]取向单晶。无论材料的温度历史如何，它都可以预测蠕变应变（一次，二次，三次）。另外，它可以用来量化所接收的γ'体积分数的轻微变化对蠕变行为的影响。

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