10CrMnMo双相钢在不同亚温淬火温度下的微观组织  

Microstructure of 10CrMnMo dual-phase steel under different intercritical quenching temperature

作　　者：周培山[1] 杨笠[2] 

机构地区：[1]西南石油大学应用技术学院,四川南充637000 [2]四川建筑职业技术学院,四川德阳618000

出　　处：《金属热处理》2017年第4期110-114,共5页Heat Treatment of Metals

基　　金：西南石油大学自然科学基金(2012XJZ-039)

摘　　要：对10CrMnMo双相钢在不同亚温淬火温度下热处理后的试样进行了显微组织、SEM形貌、显微硬度测试、马氏体含量以及马氏体-铁素体两相的晶粒尺寸分析。结果表明,不同的淬火温度致使马氏体和铁素体的显微形态和分布状况发生变化,淬火温度为720℃时马氏体呈狭长的岛状分布,随着淬火温度的升高,马氏体呈片状与岛状共存,到820℃时板条马氏体与铁素体呈纤维状共存;同时,马氏体体积分数也随之增加,由720℃淬火时的10.41%增加到820℃时的48.19%;马氏体、铁素体的晶粒大小都随着淬火温度的升高而减小,铁素体晶粒尺寸由720℃淬火时的14.23μm减小到820℃时的4.15μm,马氏体尺寸则由5.74μm减小至2.45μm,且不同淬火温度下铁素体晶粒尺寸均大于马氏体晶粒尺寸;双相钢中铁素体组织的显微硬度随着淬火温度的升高而增加,由720℃时的168.21HV1增加至820℃时的235.15HV1;马氏体组织的显微硬度则随淬火温度的升高而降低,由720℃时的713.14HV1降低到820℃时的525.41HV1。The microstructure,SEM,micro-hardness,martensite volume fraction and M-F grain size were conducted on the heat treatment specimens of 10CrMnMo dual-phase steel after different intercritical quenching temperature. The results show that the microstructure morphology and distribution of martensite and ferrite are changed under different quenching temperature. The martensite is narrow island distribution when quenching temperature is 720 ℃. The martensite is plate shaped and island coexistence with the increase of quenching temperature. The microstructure is the coexistence of lath martensite and fibrous ferrite when 820 ℃ quenching temperature. From 720 ℃ to820 ℃,the martensite volume fraction is increased from 10. 41% to 48. 19%. Ferrite grain size is reduced from 14. 23 μm to 4. 15 μm.Martensite grain size is reduced from 5. 74 μm to 2. 45 μm. Ferrite grain size is all bigger than martensite grain size under different quenching temperature. The microhardness of ferrite is increased from 168. 21 HV1 to 235. 15 HV1. The microhardness of martensite is reduced corresponding from 713. 14 HV1 to 525. 41 HV1.

关 键 词：10CrMnMo双相钢 亚温淬火 微观组织 

分 类 号：TG156.31[金属学及工艺—热处理]