Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions
Characterization of cyclic behavior, deformation mechanisms, and microstructural evolution of MarBN steels under high temperature conditions
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DOI：
10.1016/j.ijfatigue.2019.105270
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发表时间：
2020-02-01
影响因子：
6
通讯作者：
Osgerby, S.
中科院分区：
文献类型：
--
作者：
Benaarbia, A.;Xu, X.;Osgerby, S.
本文讨论了高温下MarBN钢的低周疲劳行为。采用四种循环加载波形研究了材料的力学性能和显微组织特征。力学结果显示连续循环软化和减速应力松弛，短时间和长时间尺度上的可恢复粘弹性和不可恢复的粘塑性机制。还进行了详细的显微组织表征，以研究所调查的钢的断裂行为。显微组织研究结果表明，典型的穿晶和延性断裂行为，广泛的亚晶形成和组织细化，以及断口附近硬度的显著下降。
In this paper, the low cycle fatigue behaviour of MarBN steels at elevated temperatures is discussed. Four cyclic loading waveforms were applied to investigate both the mechanical and microstructural features. The mechanical results exhibit continuous cyclic softening and decelerated stress relaxation, recoverable viscoelasticity at both short and long time scales and irrecoverable viscoplastic mechanisms. Detailed microstructural characterisation was also conducted to investigate the rupture behaviour of the investigated steel. The microstructural findings indicate typical transgranular and ductile fracture behaviour, extensive sub-grain formation and structural refinement as well as significant decrease in hardness close to the fracture surface.