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金属学报  2014, Vol. 50 Issue (12): 1413-1420    DOI: 10.11900/0412.1961.2014.00306
  论文 本期目录 | 过刊浏览 |
感应回火对1000 MPa级高强度低合金钢碳化物析出行为及韧性的影响
房玉佩, 谢振家, 尚成嘉
北京科技大学材料科学与工程学院, 北京100083
EFFECT OF INDUCTION TEMPERING ON CARBIDE PRECIPITATION BEHAVIOR AND TOUGHNESS OF A 1000 MPa GRADE HIGH STRENGTH LOW ALLOY STEEL
FANG Yupei, XIE Zhenjia, SHANG Chengjia
School of Materials Science and Engineering, University Science and Technology Beijing, Beijing 100083
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摘要: 对比研究了电磁感应及传统箱式炉2种不同回火加热方式对1000 MPa级别高强度低合金钢淬火后组织中碳化物的尺寸、形貌、分布及其对力学性能的影响. 结果表明, 实验钢淬火后组织包括下贝氏体及板条马氏体. 2种加热方式回火后, 对于下贝氏体组织, 随着回火温度由400 ℃升高至550 ℃, 碳化物由针状向短棒状转变. 其中, 经550 ℃传统加热回火后, 贝氏体内部碳化物长轴尺寸约为200 nm, 而经该温度电磁感应加热回火后其长轴尺寸约为60 nm. 对于板条马氏体组织, 经传统加热回火后, 碳化物主要沿着板条边界连串析出; 电磁感应加热回火后, 马氏体板条中析出的碳化物在板条内部及边界均匀弥散分布. 经550 ℃传统方式回火后, 马氏体中的碳化物尺寸约为200 nm, 而电磁感应回火的碳化物尺寸均小于100 nm. 经过不同加热方式回火后, 实验钢的硬度差别不显著, 随着回火温度升高, 2种加热方式回火试样冲击功均升高, 但感应加热回火后冲击功升高更为显著, 实验钢经550 ℃电磁感应加热回火后-20 ℃冲击功达到133 J, 是传统加热回火工艺的4.5倍, 实现了1000 MPa级高强度低合金钢良好的强韧化组合.
关键词 高强度低合金钢感应回火韧性纳米尺度碳化物    
Abstract:By comparing induction tempering with conventional tempering, the effect of induction reheating tempering on carbide precipitation behavior and toughness of a 1000 MPa grade high strength low alloy steel was investigated. Microstructures of the steel in different heat treatment stages were characterized using SEM and TEM (with EDS), mechanical properties inclusive of Vickers hardness and toughness were tested. The results showed that microstructure of quenched samples consisted of lath martensite and lower bainite, needle like carbides were observed in lower bainitic lath. With tempering temperature increasing from 400 ℃ to 550 ℃, the shape of carbides located within the bainitic lath gradually changed from needle like to short rod like type. Carbides were fine and well distributed using induction tempering. When the tempering temperature was 550 ℃, the long axis length of short rod like carbides located within the bainitic lath by conventional reheating tempering was 200 nm, whereas the long axis length of short rod like carbides located within the bainitic lath by induction reheating tempering was about 60 nm. When tempering by conventional reheating, carbides mainly precipitated along martensite lath boundaries, while carbides were more dispersed in the matrix lath by induction reheating, the size of these dispersed carbides was less than 100 nm when tempering temperature was 550 ℃. As a result, a superior of mechanical properties with 344 HV and Charpy impact energy of 133 J at -20 ℃ was obtained with induction reheating tempering at 550 ℃.
Key wordshigh strength low alloy steel    induction tempering    toughness    nano-sized carbide
     出版日期: 2014-12-25
基金资助:*国家重点基础研究发展计划资助项目 2010CB630801
Corresponding author: Correspondent: SHANG Chengjia, professor, Tel: (010)62332428, E-mail: cjshang@ustb.edu.cn   
作者简介: 房玉佩, 女, 1989年生, 硕士生

引用本文:

房玉佩, 谢振家, 尚成嘉. 感应回火对1000 MPa级高强度低合金钢碳化物析出行为及韧性的影响[J]. 金属学报, 2014, 50(12): 1413-1420.
FANG Yupei, XIE Zhenjia, SHANG Chengjia. EFFECT OF INDUCTION TEMPERING ON CARBIDE PRECIPITATION BEHAVIOR AND TOUGHNESS OF A 1000 MPa GRADE HIGH STRENGTH LOW ALLOY STEEL. Acta Metall Sin, 2014, 50(12): 1413-1420.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2014.00306      或      http://www.ams.org.cn/CN/Y2014/V50/I12/1413

图1  实验钢淬火态显微组织的SEM像
图2  2种加热方式在不同温度回火后实验钢中贝氏体板条内部显微组织的SEM像
图3  2种加热方式在不同温度回火后实验钢中马氏体板条边界显微组织的SEM像
图4  淬火态和经不同加热方式在550 ℃回火后实验钢析出相的TEM像
图5  实验钢以不同加热方式回火后力学性能与回火温度关系曲线
图6  不同加热方式回火板条内部碳化物长短轴比随温度变化趋势
图7  实验钢淬火及电磁感应回火后复型样品析出相形貌的TEM像及碳化物的EDS
图8  淬火态实验钢550 ℃回火后-20 ℃冲击断口的SEM像
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