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Fracture behavior of heterogeneous nanostructured 316L austenitic stainless steel with nanotwin bundles
Acta Materialia ( IF 9.4 ) Pub Date : 2018-05-01 , DOI: 10.1016/j.actamat.2018.02.065
L. Xiong , Z.S. You , S.D. Qu , L. Lu

Abstract The fracture behavior was investigated of a bulk nanostructured 316L austenitic stainless steel with embedded nanotwin bundles incorporated by dynamic plastic deformation. The nanotwin bundles were demonstrated to be critical to strengthen and toughen the as-deformed samples with mixed microstructures of nano-grains and nano-twins. With increment in strength, the fracture toughness decreases due to the generation of increasingly more nano-grains. Additional controlled thermal annealing that makes the nano-grains recover or recrystallize leads to reduced strengths but more remarkably improved fracture toughness. The enhanced strength−fracture toughness synergy can be attributed to the nanotwin bundles that constrict the damage development in the matrix of either nano-grains or recrystallized grains, and that resist crack propagation via acting as ductile crack bridging ligaments.

中文翻译:

具有纳米孪晶束的异质纳米结构316L奥氏体不锈钢的断裂行为

摘要 研究了块状纳米结构 316L 奥氏体不锈钢的断裂行为,其中嵌入了通过动态塑性变形结合的纳米孪晶束。纳米孪晶束被证明对于强化和增韧具有纳米晶粒和纳米孪晶混合微观结构的变形样品至关重要。随着强度的增加,由于越来越多的纳米晶粒的产生,断裂韧性降低。使纳米晶粒恢复或再结晶的额外受控热退火导致强度降低但更显着地提高断裂韧性。增强的强度-断裂韧性协同作用可归因于纳米孪晶束限制了纳米晶粒或再结晶晶粒基质中的损伤发展,
更新日期:2018-05-01
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