本文实验发现预应变对16MnR钢的断裂韧性具有显著的影响,断裂过程中裂尖区域材料的组织结构发生了变化,裂纹在二次珠光体组织上扩展。16MnR钢断裂韧性的大小取决于碳原子的扩散及二次珠光体组织生成的难易程度。
The prestrain on 16MnR steel was found experimentally to influenceupon its fracture toughness remarkably. During fracturing, the microstructural chan-ge was taken place in the crack tip zone, The cracks will propagate on the second-ary pearlite structure. It is believed that the fracture toughness of 16MnR steel isdependent on the diffusion of carbon atoms and the formability of secondary pearl-ite structure.
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