0.6Ni中碳合金钢的奥氏体连续冷却转变行为  被引量:7

Continuous cooling transformation behavior of austenite in 0.6Ni alloyed medium carbon steel

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作  者:蒋波[1] 胡学文[1,2] 周乐育 王芝林[4] 赵海东[4] 刘雅政[1] Jiang Bo;Hu Xuewen;Zhou Leyu;Wang Zhilin;Zhao Haidong;Liu Yazheng(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Maanshan Iron and Steel Co.,Ltd.,Maanshan Anhui 243002,China;Beijing Research Institute of Mechanical&Electrical Technology Ltd.,Beijing 100083,China;Xining Special Steel Co.,Ltd.,Xining Qinghai 810005,China)

机构地区:[1]北京科技大学材料科学与工程学院,北京100083 [2]马鞍山钢铁股份有限公司,安徽马鞍山243002 [3]北京机电研究所有限公司,北京100083 [4]西宁特殊钢股份有限公司,青海西宁810005

出  处:《金属热处理》2020年第4期10-15,共6页Heat Treatment of Metals

基  金:国家自然科学基金(51701015)。

摘  要:通过热模拟试验、光学和扫描电镜(SEM)观察以及维氏硬度测试,研究了0. 6Ni中碳合金钢的动态和静态奥氏体连续冷却转变规律,分析了变形以及合金元素Ni对中碳合金钢奥氏体转变行为的影响。结果表明:奥氏体变形有效抑制了0. 6Ni中碳合金钢连续冷却后铁素体和珠光体的形成,大幅促进了贝氏体和马氏体相变,将全马氏体临界冷速由5℃/s降低到3℃/s。试验钢在动态连续冷却条件下,冷速为3℃/s时,全马氏体组织显微硬度为810 HV0. 1;而静态连续冷却条件下,冷速为5℃/s时,全马氏体组织显微硬度为689 HV0. 1。奥氏体变形的再结晶细化作用可以明显细化冷却后的马氏体组织,进而提高马氏体的硬度。在奥氏体静态连续冷却条件下,中碳合金钢中0. 6Ni元素的加入,抑制了铁素体和珠光体相变,大幅促进贝氏体和马氏体相变,提高了奥氏体的稳定性,将Ms点从329℃降低到304℃,马氏体临界冷速从0. 5℃/s降低到0. 3℃/s;相对于约0. 4Mn元素的加入,0. 6Ni元素的加入可以大幅抑制铁素体和珠光体相变,可以将Ms点从320℃降低到304℃,同时可以有效细化奥氏体冷却后的显微组织。The dynamic and static continuous cooling transformation and effects of deformation and nickel in 0. 6 Ni medium carbon steel were carefully investigated by means of hot simulation tests,optical microscope and SEM observations and Vickers hardness test. Experimental results show that the ferrite and pearlite transformations are effectively suppressed while the bainite and martensite transformations are greatly promoted by the deformation in austenite region of the tested steel. Then,the critical cooling rate of full martensite is also lowered from 5 ℃/s to3 ℃/s. The hardness of full martensite is 810 HV0. 1 at the cooling rate of 3 ℃/s under the dynamic continuous cooling condition.However,the hardness of full martensite is 689 HV0. 1 at the cooling rate of 5 ℃/s under the static continuous cooling condition. The improvement of martensite hardness can be attributed to the refinement of martensite due to the deformation recrystallization of austenite. The ferrite and pearlite transformations are suppressed and the bainite and martensite transformations are promoted by the addition of 0. 6 Ni because of the improvement of austenite stability. Then,the Ms temperature is lowered from 329 ℃ to 304 ℃ and also the critical cooling rate of martensite transformation is reduced from 0. 5 ℃/s to 0. 3 ℃/s. Compared with that of the addition of 0. 4 Mn,the ferrite and pearlite transformation is largely hindered and the Ms temperature is lowered from 320 ℃ to 304 ℃ by the addition of 0. 6 Ni. At the same time,the microstructure after cooling is also effectively refined.

关 键 词:中碳合金钢 CCT曲线 合金元素 显微组织 硬度 

分 类 号:TG142.1[一般工业技术—材料科学与工程]

 

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