|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Diffusion Behavior of Alloy Elements in Martensite-austenite Constituent Formed in the Heat-affected Zone of a Low Alloy Carbon Steel
||Masahiro Inomoto, Hidenori Nako
|On-Site Speaker (Planned)
Martensite-austenite constituent (MA) formed in the heat-affected zone (HAZ) has a detrimental effect on HAZ toughness due to its high hardness. In order to control MA, it is important to be aware of the diffusion and distribution behavior of alloy elements among the matrix phase and MA during thermal cycle. However, few studies have focused on these things during a short-time thermal cycle like HAZ. This study investigated the diffusion and distribution behavior during the thermal cycle. This was done by simulating intercritically reheated coarse-grained HAZ. Fe-C-Si-Mn-Al-Nb alloys were heated to austenitizing temperature, cooled to room temperature, subsequently reheated to intercritical temperatures and cooled at various rates. Atom probe analysis revealed that the carbon content in the martensite phase of MA formed in the thermal cycle with a cooling rate of 10 K/s was higher than in the water-quenched cycle and equilibrium concentration at intercritical temperature.
||Planned: Supplemental Proceedings volume