Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 2, Pages 1500-1508Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2019.11.075
Keywords
Hadfield steel; Dynamic strain ageing; Serrated flow; Failure behavior
Funding
- National Natural Science Foundation of China [51801063]
- Natural Science Foundation of Hunan Province [2019JJ50586, 2018JJ2681]
- Scientific Research Project of Hunan Provincial Department of Education [18B193]
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A Hadfield steel has been investigated to clarify the serrated flow and to explore the failure behavior at room temperature. The tensile experiments were performed under extensometer-measured strain control, rather than under conventional cross-head displacement control, at strain rates ranging from 6 x 10(-3) s(-1) to 6 x 10(-6) s(-1). Three types of serrations, including type A, B and C ones, are observed. The occurrence of different types of serrations depends on both strain rate and strain level. The type C serration is identified in Hadfield steels at room temperature for the first time. At high strain rates, there is substantially higher serration density and reduction in stress compared with that observed at low strain rates. Furthermore, two different initiation modes of deformation bands are revealed. The fracture crack nucleates at a position with dense twins, and propagates primarily in the direction perpendicular to the tensile axis and deflects frequently due to the interaction with the boundary of grains and twins. (C) 2019 The Authors. Published by Elsevier B.V.
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