微合金高强度低碳贝氏体钢中不同强化方式的作用
Strengthening Factors of Microalloyed High Strength Low Carbon Bainitic Steel
摘 要
为了掌握微合金高强度低碳贝氏体钢中不同强化方式的贡献大小,采用正电子湮没技术、透射电子显微镜及扫描电子显微镜分析了该钢热轧和回火处理后的显微组织、位错密度及第二相粒子的形貌及尺寸,对其屈服强度进行了定量计算,并采用多功能材料试验机对该钢的力学性能进行了测试.结果表明:该钢的位错密度约为2.65×1014 m-2,位错强化是该钢主要的强化方式,对屈服强度的贡献值约327 MPa,占其屈服强度的41.3%;该钢中存在大量细小弥散的球状或近球状的(Ti,Nb)(C,N)第二相粒子,其尺寸多在10 nm以下,析出强化对屈服强度的贡献值约为172 MPa,占屈服强度的21.7%;固溶强化和间隙原子强化的贡献值分别约为129 MPa和94 MPa,分别占屈服强度的16.3%和11.9%;理论计算值与实测值基本吻合.
低碳贝氏体钢
位错强化
析出强化
strengthening
low carbon bainitic steel
dislocation strengthening
precipitation strengthening
Abstract
In order to learn the contribution of different reinforcement modes,after hot rolling with mill and tempering,the microstructure,dislocation density,second phase morphology and size of low carbon bainitic steel were investigated by using SEM,TEM and positron annihilation technology.The yield strength was quantitatively calculated.The mechanical properties of the tested steel were determined by using multi-function material testing machine.The results show that the dislocation density was about 2.65 × 1014 m-2.Dislocation strengthening which was the main mode contributed 327 MPa to the yield strength,which accounted for 41.3% of the yield strength.A large number of fine spherical and near-spherical (Ti,Nb)(C,N) second phase particles were observed and the size of most particles was less than 10 nm,which contributed 172 MPa to the yield strength and accounted for 21.7%.Solution strengthening and interstitial atom strengthening contributed 129 MPa and 94 MPa to the yield strength,which accounted for 16.3% and 11.9% respectively.The strength value calculated by the strengthening mechanism model was very close to the measured value.
中图分类号 TG142.1
所属栏目 试验研究
基金项目 江西省自然科学基金资助项目(0605123)
收稿日期 2008/11/3
修改稿日期 2009/9/8
网络出版日期
作者单位点击查看
备注王克鲁(1968-),男,山东冠县人,副教授,博士.
引用该论文: WANG Ke-lu,LU Shi-qiang,LI Xin,ZHENG Hai-zhong,DONG Xian-juan. Strengthening Factors of Microalloyed High Strength Low Carbon Bainitic Steel[J]. Materials for mechancial engineering, 2009, 33(12): 27～29
王克鲁,鲁世强,李鑫,郑海忠,董显娟. 微合金高强度低碳贝氏体钢中不同强化方式的作用[J]. 机械工程材料, 2009, 33(12): 27～29
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参考文献
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【6】王六定,朱明,陈景东,等.低碳超超高强度贝氏体钢的组织细化[J].材料热处理学报,2007,28(5):42-45.
【7】康永林,于浩,王克鲁,等.CSP低碳钢薄板坯组织演变及强化机理研究[J].钢铁,2003,38(8):20-26.
【8】聂燚,董文龙,赵运堂,等.高强度低碳贝氏体钢工艺和组织对性能的影响[J].北京科技大学学报,2006,28(8):733-738.
【9】康永林,陈庆军,王克鲁,等.700MPa级低碳贝氏体钢的热处理工艺研究[J].材料热处理学报,2005,26(3):96-99.
【10】吴弈初,张晓红.正电子湮没技术在金属和合金研究中的应用进展[J].物理,2000,29(7):401-405.
【11】王克鲁,康永林,于浩,等.CSP工艺热轧低碳带钢位错形貌及密度分析[J].北京科技大学学报,2003,25(6):591-592.
【12】翁宇庆.超细晶钢-钢的组织细化理论与控制技术[M].北京:冶金工业出版社,2003.
【13】MAJTA J,LENARD J G,PIETRZYK M.A study of the effect of the thermomechanical history on the mechanical properties of a high niobium steel[J].Materials Science and Engineering A,1996,208:249-259.
【14】MAJTA J,KUZIAK R,PIETRZYK M.Modelling of the influence of thermomechanical processing of Nb-Microalloyed steel on the resulting mechanical properties[J].Journal of Materials Processing Technology,1998,80/81:524-530.
【15】金丝伯格 V B.板带轧制工艺学[M].北京:冶金工业出版社,1998.
【16】KANG Y L,WANG X J.Dislocation densities of deformed steel sheets based on positron annihilation[J].Journal of University Science and Technology Beijing,1998,5(1):47-50.
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