The effect of clustering on the mobility of dislocations during aging in Nb-microalloyed strip cast steels: In situ heating TEM observations

作者：Shrestha Sachin L^*; Xie Kelvin Y; Ringer Simon P; Carpenter Kristin R; Smith David R; Killmore Chris R; Cairney Julie M

来源：Scripta Materialia, 2013, 69(6): 481-484.

DOI：10.1016/j.scriptamat.2013.06.007

• HSLA steel
• In situ heating TEM
• Recovery
• Niobium
• Atom probe tomography

Cluster-strengthened Nb-microalloyed strip cast steels are of interest as clustering during aging leads to an enhancement in strength without compromising ductility, resulting in desirable mechanical properties. However, the precise strengthening mechanism is not well understood. Using in situ heating transmission electron microscopy, clustering was found to impede the movement of dislocations during aging. The attractive combination of ductility and strength was attributed to the effects of recovery and the restricted movement of dislocations through clustering.

• 出版日期2013-9