纳米孪晶强化304奥氏体不锈钢的应变控制疲劳行为

潘庆松, 崔方, 陶乃镕, 卢磊

Strain-Controlled Fatigue Behavior of Nanotwin- Strengthened 304 Austenitic Stainless Steel

PAN Qingsong, CUI Fang, TAO Nairong, LU Lei

图6 纳米孪晶强化304 SS在高应变幅疲劳(0.25%)时的微观结构特征和孪晶片层厚度

Fig.6 Overview TEM images of the microstructure in NT-strengthened 304 SS fatigued at Δε pl / 2 of 0.25% (a), high-magnification image of one typical NT grain undegoing cyclic plastic strain with correlated necklace dislocations denoted by white arrows (b) and its surrounding SRX grains with tiny α' martensite (denoted by the black arrows) around dislocation walls (c), compared to that far away from NT grains (d), and corresponding distribution of twin lamella thickness (λ) (e) (The black arrows in Figs.6a denote dislocation cell in SRX, inset in Fig.6c is the SAED pattern)