Microstructural characterization of an as-quenched HSLA-100 plate steel via transmission electron microscopy

作者：Thompson S W^*

来源：Materials Characterization, 2013, 77: 89-98.

DOI：10.1016/j.matchar.2013.01.002

• HSLA-100
• TEM
• Martensite
• Retained austenite
• Electron diffraction

Detailed analysis of an HSLA-100 steel via transmission electron microscopy revealed a "fully" martensitic microstructure, despite a low carbon content of 0.06 mass%, a fine prior austenite grain size of about 10 gm, and a modest cooling rate of approximately 15 degrees C/s. Martensite laths typically contained a moderate-to-high dislocation content, and occasional regions of twinned martensite were observed. Laths were contained wholly within single grains of austenite, and about 5% austenite was present in the final as-cooled microstructure. Martensite crystals exhibited the Kurdjumov-Sachs orientation relationship with respect to the parent austenite phase, and multiple variants of this relationship were observed for adjacent packets. Autotempering of martensite resulted in a low volume fraction of cementite precipitates in the largest, first-formed laths.

• 出版日期2013-3