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首页> 外文会议>Pacific Rim International Conference on Advanced Materials and Processing(PRICM 5) pt.1; 20041102-05; Beijing(CN) >Subsurface Microstructure Evolution of Hadfield Steel under High Impact Energy
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Subsurface Microstructure Evolution of Hadfield Steel under High Impact Energy

机译：高冲击能下哈德菲尔德钢的表面下组织演变

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摘要

It has been well known that Hadfield steel behaviors excellent wear resistance under high impact energy. Up to now there exist many theories to explain the wear mechanism of Hadfield steel. In this research subsurface microstructure evolution process of Hadfield steel was investigated after high energy impact experiments. It was shown from high resolution electron microscope (HRTEM) examination of subsurface microstructure that nanocrystallized austenite grains have been formed in the procedure of the reaction and rearrangement of high density dislocations under the heavy plastic deformation, sub-grains as a transitional structure and, finally, the formation of nano austenite grains. On the other side, the interactions of twins and stack faults or dislocations and stack faults make austenite crystals transform to amorphous solid. With increasing impact cycles the sizes of nano-grains were decreased and the amorphous volumes were increased further. A large amount of nano-sized grains embedded in bulk amorphous matrix were fully developed, which will dominate the wear of the steel. In the subsurface no martensitic transformation was observed.
机译：众所周知，哈德菲尔德钢在高冲击能量下具有出色的耐磨性。到目前为止，已有许多理论来解释哈德菲尔德钢的磨损机理。在这项研究中，通过高能冲击实验研究了哈德菲尔德钢的地下微观组织演化过程。高分辨电子显微镜（HRTEM）对表面微观结构的检查表明，在重塑性变形下，高密度位错的反应和重排过程中，形成了纳米晶奥氏体晶粒，亚晶粒为过渡结构，最后，形成纳米奥氏体晶粒。另一方面，孪晶和堆垛层错或位错和堆垛层错的相互作用使奥氏体晶体转变为非晶态固体。随着冲击周期的增加，纳米颗粒的尺寸减小，无定形体积进一步增加。充分开发出了嵌入块状无定形基体中的大量纳米晶粒，这将主导钢的磨损。在地下没有观察到马氏体相变。

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