G. Dini
材料科学技术（英文）
The aim of the present work was to study the effect of austenite grain size (AGS) on the martensite formation in a high-manganese twinning-induced plasticity (TWIP) steel. The results of a quantitative microstructural characterization of the steel by the whole X-ray pattern fitting Rietveld software, materials analysis using diffraction (MAUD), indicated that the volume fraction of ffbcc-martensite increases with increasing AGS. However, the value of the stacking fault probability (Psf ) does not show a large variation for samples with different values of AGS under water-quenching conditions.
关键词:
Austenite grain size
,
martensite formation
,
TWIP steel
,
stacking fault probability
黄姝珂刘建辉李昌安周丹晨李宁文玉华
金属学报
探讨了Fe-Mn合金的高阻尼机制并采用G-L位错脱钉模型对其进行描述, 同时通过测定层错几率, 揭示了预变形(0-10%)对Fe-Mn合金阻尼性能影响的本质. 采用倒扭摆测试合金的阻尼性能, SEM和TEM观察显微组织, XRD测定物相体积分数和层错几率. 结果表明, Fe-Mn合金的高阻尼性能来源于层错界面上Shockley不全位错的脱钉运动, 实验结果很好地符合G-L位错脱钉模型; 预变形量小于4%时, 预变形处理虽然对合金的ε马氏体量没有太大影响, 但明显增加了其层错几率, 即Shockley不全位错的数量, 合金的阻尼性能随变形量增加逐渐提高; 预变形量大于4%时, 由于ε马氏体和层错的相互交割, 增大了Shockley不全位错的脱钉难度, 所以合金的阻尼性能随变形量增加逐渐下降.
关键词:
阻尼合金
,
Fe-Mn alloy
,
Shockley partial dislocation
,
stacking fault probability
,
pre-deformation
