Effect of Long-time Aging on Microstructure of ZG1Cr11Ni2WMoV Martensitic Heat Resistant Casting-steel
Author of the article:LU Hongguo;YIN Fengshi;MA Zhonggang;WANG Lei;LI Huakun;WANG Guanghua;LI Daoqian
Author's Workplace：School of Mechanical Engineering,Shandong University of Technology,Zibo255049,China;Shandong Ruitai NewMaterial Technology Co.,Ltd.,Yiyuan256100,China
Key Words：long-time aging nano-sized precipitate martensitic heat resistant steel laves phase
Abstract：
The effects of long-time aging at 580℃on the microstructure of ZG1 Cr11 Ni2 WMoV martensitic heat resistant casting-steel were studied by SEM equipped with energy dispersive spectrum analysis,TEM and optical microscope.The results show that after 1 050℃for 1 h air cooling quenching and 580℃for 2 h air cooling and tempering,the nano-sized M6 C carbides are dispersedly distributed on the tempered martensite laths.During long-term aging treatment at 580℃for1 000 hrs,the M23 C6 carbides was precipitated from the grain boundary of austenite and martensite,while the M23 C6 carbides and laves phases are precipitated fromδ-ferrite.
