Determination of dislocation density by electron backscatter diffraction and X-ray line profile analysis in ferrous lath martensite

详细信息    查看全文

• 作者：Tibor Berecz^a ; ^{berecz@eik.bme.hu" class="auth_mail" title="E-mail the corresponding author} ; Pé ; ter Jenei^b ; ^{jenei@metal.elte.hu" class="auth_mail" title="E-mail the corresponding author} ; Andrá ; s Csó ; ré ; ^a ; ^{csorean@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Já ; nos Lá ; bá ; r^c ; ^{labar@mfa.kfki.hu" class="auth_mail" title="E-mail the corresponding author} ; Jenő Gubicza^b ; ^{jeno.gubicza@ttk.elte.hu" class="auth_mail" title="E-mail the corresponding author} ; Pé ; ter Já ; nos Szabó ; ^a ; ^{szpj@eik.bme.hu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Martensite ; Electron back scatter diffraction ; Misorientation ; X-ray diffraction ; Dislocation density
• 刊名：Materials Characterization
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：113
• 期：Complete
• 页码：117-124
• 全文大小：1844 K

文摘

The microstructure and the dislocation density in as-quenched ferrous lath martensite were studied by different methods. The blocks, packets and variants formed due to martensitic transformation were identified and their sizes were determined by electron backscatter diffraction (EBSD). Concomitant transmission electron microscopy (TEM) investigation revealed that the laths contain subgrains with the size between 50 and 100 nm. A novel evaluation procedure of EBSD images was elaborated for the determination of the density and the space distribution of geometrically necessary dislocations from the misorientation distribution. The total dislocation density obtained by X-ray diffraction line profile analysis was in good agreement with the value determined by EBSD, indicating that the majority of dislocations formed due to martensitic transformation during quenching are geometrically necessary dislocations.