Microstructural features and precipitation behavior of Ti,Nb and V microalloyed steel during isothermal processing
作者机构：School of Environment and Chenlical EngineeringShenyang Ligong UniversityShenyang 110159LiaoningChina College of Materials Science and EngineeringShenyang Aerospace UniversityShenyang 110136LiaoningChina State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110004LiaoningChina
出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)
年 卷 期：2019年第26卷第1期
页 面：102-111页
核心收录：
基 金：supported by the National High Technology Research and Development Program (‘‘863'' Program) of China the Liaoning Provincial Science and Technology Plan Project
主 题：Microalloyed steel Isothermal holding time Microstructural constituent Precipitation Hardness
摘 要：Thermal simulations of Ti,Nb and V microalloyed steel were conducled using a thermomechanical simulator,and the microstructural evolution and the precipitation behavior during isothermal processing were *** results show that with increasing holding time,the microstructural constituents change from the martensite and bainitic ferrites to granular bainite and polygonal *** maximum hardness is obtained for the specimen after isothermal holding for 5s due to the martensite strengthening *** hardness of the specimen decreases after isothermal holding for 10s,because the strengthening contribution of fine dispersed precipitates becomes *** hardness values of the specimens increase and then remain high after isothermal holding for 60 and *** is attributed to the contribution of the interphase precipitation hardening to the hardness of the studied *** precipitates in the specimen are coarsened after isothermal holding for 3600s,even though the coarsening is not *** precipitates are fee(***)(N.C)particles and belong to the MX-type *** beneficial effects of precipitation strengthening are *** hardness decreases to a minimum hardness value due to the presence of large amounts of polygonal ferrite after isothermal holding for *** coarse precipitates are the primary origin of the hardness decrease.
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