超声辅助铸造对35CrMo钢锭热变形机制及微观组织的影响

Effect of Ultrasonic-Assisted Casting on Hot Deformation Mechanism and Microstructure of 35CrMo Steel Ingot.

作者信息

Yang Qiumei, Zhou Yajun, Zhang Wei, Zhang Xun, Xu Mengfei

机构信息

School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

National Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2021 Dec 25;15(1):146. doi: 10.3390/ma15010146.

DOI:10.3390/ma15010146

PMID:35009292

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8745826/

Abstract

Hot compression tests were performed with strain rates (0.01-10 s) and temperatures (850-1150 °C). The power law relationship between the critical stress and critical strain and Zener-Hollomon parameters was determined by - curves. Microstructure was investigated by electron backscattered diffraction. The results showed that the flow behavior and microstructure of 35CrMo steel was affected by ultrasonic-assisted casting. The activation energy of non-ultrasonic and ultrasonic-assisted 35CrMo steel were 410 ± 9.9 and 386 ± 9.4 kJ/mol, respectively, and the activation energy of ultrasonic-assisted specimens was reduced by 6%. In addition, the ultrasonic-assisted treatment refines the grains to some extent and makes the softening process of ultrasonic-assisted samples progress faster, which promoted the development of dynamic recrystallization and the production of 3 boundaries. The discontinuous dynamic recrystallization was the main DRX nucleation mechanism of the 35CrMo steel.

摘要

在应变速率（0.01 - 10 s⁻¹）和温度（850 - 1150 °C）条件下进行了热压缩试验。通过 - 曲线确定了临界应力与临界应变以及齐纳 - 霍洛蒙参数之间的幂律关系。采用电子背散射衍射研究了微观结构。结果表明，35CrMo钢的流变行为和微观结构受超声辅助铸造的影响。非超声和超声辅助35CrMo钢的激活能分别为410 ± 9.9和386 ± 9.4 kJ/mol，超声辅助试样的激活能降低了6%。此外，超声辅助处理在一定程度上细化了晶粒，使超声辅助样品的软化过程进展更快，这促进了动态再结晶的发展以及3种晶界的产生。不连续动态再结晶是35CrMo钢主要的动态再结晶形核机制。