Severe plastic deformation through adiabatic shear banding in Fe–C steels
Severe plastic deformation through adiabatic shear banding in Fe–C steels
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DOI：
10.1016/j.msea.2005.08.138
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发表时间：
2004-12
期刊：
影响因子：
6.4
通讯作者：
D. Lesuer;C. Syn;O. Sherby
中科院分区：
文献类型：
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作者：
D. Lesuer;C. Syn;O. Sherby
在铁碳素钢的绝热剪切带内观察到严重的塑性变形。这些剪切带是在高应变率条件下形成的，超过1000s−1，通常可以观察到5数量级或更大的应变。研究了超高碳钢（1.3% C）在珠光体条件下剪切带的形成。带内硬度达到11.5GPa （4600MPa）。描述了在剧烈塑性变形和绝热加热过程中奥氏体相变的高强度机理。快速的再转变导致含有碳的超细铁素体晶粒尺寸，主要以纳米碳化物的形式存在。提出了同样的机制来解释在球磨、球落试验和严重变形钢丝中观察到的铁-碳钢的超高强度。
Severe plastic deformation is observed within adiabatic shear bands in iron–carbon steels. These shear bands form under high strain rate conditions, in excess of 1000s−1, and strains in the order 5 or greater are commonly observed. Studies on shear band formation in a ultra-high carbon steel (1.3% C) are described in the pearlitic condition. A hardness of 11.5GPa (4600MPa) is obtained within the band. A mechanism is described to explain the high strength based on phase transformation to austenite from severe plastic deformation and adiabatic heating. Rapid re-transformation leads to an ultra-fine ferrite grain size containing carbon principally in the form of nano-size carbides. It is proposed that the same mechanism explains the ultra-high strength of iron–carbon steels observed in ball-milling, ball drop tests and in severely deformed wires.