摘要
Abstract
The effect of water toughening and aging treatment on the microstructure and hardness of high manganese steel was studied,the microstructure was analyzed by confocal laser microscopy and X-ray diffraction(XRD),the Vickers hardness was measured by mi-crohardness tester.The results show that the microstructure after water toughening is austenite and a small amount of carbide,when the holding time was short,the carbide dissolved incomplete,with the holding time extended,the carbide completely dissolved,austenite grains grow;Compared with the as-cast structure hardness of HV 461.6,the microstructure hardness after water toughening treatment decreased to HV 229.9.With the increase of aging temperature and the extension of holding time,needle-like carbides will be precipi-tated at the austenite grain boundary first,then these needle-like carbides will grow into the grain interior,and point-like carbides will be precipitated at the grain boundary;With the increase of aging temperature,the microhardness value increased gradually,and when the microstructure changed obviously,the microhardness value of the sample increased suddenly;When the holding time increased from 1 h to 3 h,the microhardness of the sample mostly increased,but the microhardness of the aging temperature 300℃and 350℃had little difference.关键词
高锰钢/水韧处理/时效处理/显微组织/硬度Key words
high manganese steel/water toughening treatment/aging treatment/microstructure/hardness分类
矿业与冶金
