Impact of dynamic recrystallization in laser shock peening predicted via a coupled cellular automata finite element model

IF 2 Q3 ENGINEERING, MANUFACTURING
Karl Bailey , Sumair Sunny , Ritin Mathews , Arif Malik
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引用次数: 0

Abstract

A coupled cellular automata-finite element (CAFE) model has been developed to simulate the phenomenon of dynamic recrystallization (DRX) during the laser shock peening (LSP) process on the titanium alloy, Ti6Al4V. Although microstructure changes resulting from DRX during LSP treatment have been observed and studied experimentally, there is no work to-date on a model that is capable of simulating LSP while also capturing the potential effects of microstructure evolution due to DRX. Creating an LSP model that couples DRX during the high intensity shock wave propagation is a major challenge considering the very high-strain rates and nanosecond-scale time duration, as well as the requirement to repeatedly update the grain boundary locations and the localized mechanical properties of grains during the simulation. This paper introduces the first modeling framework for simulating microstructural evolution due to DRX during the LSP treatment process. The framework includes predictions of both continuous DRX (cDRX) and discontinuous DRX (dDRX), as well as the influence of the predicted microstructure evolution on the resulting stress–strain fields arising from LSP treatment. For an experimentally determined initial microstructure and specific LSP process parameters, the final state of residual stress predicted by this CAFE model shows substantially increased local variation in the compressive stress field as compared to the case when DRX is not considered. This variation is particularly evident in the vicinity of the part surface where most of the DRX is observed and predicted to occur. In addition, based on the process conditions for the specific LSP treatment considered, cDRX is predicted to be the dominant mechanism of microstructural evolution. This is because the overall temperature increase that occurs during LSP, arising due to plastic deformation alone when an ablative surface coating is included, is found to be insufficient to induce dDRX-based nucleation in the Ti6Al4V alloy.
用耦合元胞自动机有限元模型预测激光冲击强化过程中动态再结晶的影响
建立了元胞自动机-有限元(CAFE)耦合模型,模拟了Ti6Al4V钛合金激光冲击强化过程中的动态再结晶(DRX)现象。虽然在实验中已经观察和研究了DRX在LSP处理过程中引起的微观结构变化,但迄今为止还没有一个模型能够在模拟LSP的同时捕获DRX引起的微观结构演变的潜在影响。考虑到高强度激波传播过程中应变速率和纳秒级的持续时间,以及在模拟过程中反复更新晶界位置和晶粒局部力学性能的要求,创建一个耦合DRX的LSP模型是一个主要挑战。本文介绍了第一个用于模拟LSP处理过程中DRX引起的微观结构演变的建模框架。该框架包括连续DRX (cDRX)和不连续DRX (dDRX)的预测,以及预测的微观结构演变对LSP处理产生的应力-应变场的影响。对于实验确定的初始微观结构和特定的LSP过程参数,与不考虑DRX的情况相比,该CAFE模型预测的残余应力最终状态在压应力场中的局部变化显著增加。这种变化在大部分DRX观测和预测发生的零件表面附近尤为明显。此外,根据具体LSP处理的工艺条件,预测cDRX是微观组织演化的主要机制。这是因为当包括烧蚀表面涂层时,LSP过程中由于塑性变形引起的整体温度升高不足以诱导Ti6Al4V合金中的ddrx基形核。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Manufacturing Letters
Manufacturing Letters Engineering-Industrial and Manufacturing Engineering
CiteScore
4.20
自引率
5.10%
发文量
192
审稿时长
60 days
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