Understanding sustained coarsening driven by cyclic phase transformation in additively manufactured Ti-6Al-4V
Understanding sustained coarsening driven by cyclic phase transformation in additively manufactured Ti-6Al-4V
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了解增材制造的 Ti-6Al-4V 中循环相变驱动的持续粗化
DOI：
10.1016/j.jallcom.2022.165322
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发表时间：
2022-05
影响因子：
6.2
通讯作者：
Jincheng Wang
中科院分区：
文献类型：
--
作者：
Yujian Wang;Junjie Li;Jianwei Li;Lei Zhang;Jiankai Ma;Zhijun Wang;Feng He;Jincheng Wang
Ti - 6Al - 4V中篮状α + β微观结构的粗化是在增材制造和循环热处理过程中的热循环期间常见的现象。这种粗化过程是由多次溶解和沉淀转变驱动的，而非传统的奥斯特瓦尔德熟化。显然，在第一个循环中，加热阶段最薄的α片层的完全溶解为冷却阶段幸存的片层重新生长提供了大的空间，这导致第一个循环后发生粗化。然而，在重复的热循环中α片层如何继续消失以及剩余的α片层如何持续粗化仍不清楚。在本研究中，进行了循环热处理实验和相场模拟以阐明热循环过程中持续粗化的机制。研究发现，除了在第一个热循环中最薄的α片层完全溶解外，在重复的热循环中α片层以两种此前未报道过的方式继续消失。α片层这种持续消失的根源与吉布斯 - 汤姆逊效应有关。此外，还检测了循环频率和总时长对转变粗化的影响。实验和模拟结果均表明，长的循环时长会导致严重粗化，而对于给定的时长，α片层的最终粗化几乎与循环频率无关。
• 在重复的热循环过程中，α片层可以以三种方式消失。
• α片层持续消失的根源与吉布斯 - 汤姆逊效应有关。
• 转变粗化对循环时间比对频率更敏感。
Coarsening of the basketweave α + β microstructure in Ti-6Al-4V is a common phenomenon that occurs during thermal cycling in both additive manufacturing and cyclic heat treatment. Such a coarsening process is driven by multiple dissolution and precipitation transformations rather than by conventional Ostwald ripening. It is clear that during the first cycle, the complete dissolution of the thinnest α plates at the heating stage provides large spaces for surviving plates to regrow at the cooling stage, which results in coarsening after the first cycle. However, it is still unclear how the α plates continue to vanish and the remaining α plates sustainably coarsen in the repeated thermal cycles. In this study, cyclic heat-treatment experiments and phase-field simulations were conducted to illustrate the mechanism of sustained coarsening during thermal cycling. It was found that in addition to the complete dissolution of the thinnest α plates in the first thermal cycle, α-plate vanishing continued during repeated thermal cycling in two ways, which has not been reported before. The origin of such sustained vanishing of α plates is related to the Gibbs–Thomson effect. Moreover, the influences of cycling frequency and total duration on the transformation coarsening are detected. Both the experimental and simulation results indicate that long cycling duration results in severe coarsening, while for a given duration time, the final coarsening of the α plates is almost independent of the cycling frequency. • During the repeated thermal cycling,α–plates vanishing can continue in three ways. • The origin of sustained vanishing of α plates is related to Gibbs–Thomson effect. • The transformation coarsening is more sensitive to cycling time than frequency.
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影响因子：
9.4
作者：
S. Kim
通讯作者：
S. Kim
影响因子：
1.8
作者：
S. Kim;W. Kim;Toshio Suzuki;M. Ode
通讯作者：
S. Kim;W. Kim;Toshio Suzuki;M. Ode
影响因子：
11
作者：
Bintao Wu;Zhijun Qiu;B. Dong;D. Wexler;Z. Pan;K. Carpenter;Diego Raimundi Corradi;Huijun Li
通讯作者：
Bintao Wu;Zhijun Qiu;B. Dong;D. Wexler;Z. Pan;K. Carpenter;Diego Raimundi Corradi;Huijun Li
DOI：
10.1007/s11661-016-3746-6
发表时间：
2016-09
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
B. Radhakrishnan;S. Gorti;S. Babu
通讯作者：
B. Radhakrishnan;S. Gorti;S. Babu
影响因子：
6
作者：
Chen, Q;Ma, N;Wang, YZ
通讯作者：
Wang, YZ