QT工艺对一种B-Nb低碳贝氏体钢组织及强韧性的影响

doi:10.12068/j.issn.1005-3026.2019.11.008

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (11): 1561-1567.DOI: 10.12068/j.issn.1005-3026.2019.11.008

QT工艺对一种B-Nb低碳贝氏体钢组织及强韧性的影响

任家宽，阎冬，陈俊，刘振宇

(东北大学材料科学与工程学院，辽宁沈阳110819)

收稿日期:2019-02-15 修回日期:2019-02-15 出版日期:2019-11-15 发布日期:2019-11-05
通讯作者: 任家宽
作者简介:任家宽(1993-)，男，山东潍坊人，东北大学博士研究生; 刘振宇(1968-)，男，内蒙古赤峰人，东北大学教授，博士生导师.
基金资助:
中央高校基本科研业务费专项资金资助项目(N170708018); 国家自然科学基金资助项目(U1660117).

Effect of QT Treatment on Microstructure and Obdurability of a B-Nb Low Carbon Bainite Steel

REN Jia-kuan， YAN Dong， CHEN Jun， LIU Zhen-yu

School of Material Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2019-02-15 Revised:2019-02-15 Online:2019-11-15 Published:2019-11-05
Contact: LIU Zhen-yu
About author:-
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摘要/Abstract

摘要： 通过室温拉伸、摆锤冲击、光学及扫描电镜研究了QT(淬火+回火)工艺对实验钢晶界比例、晶粒尺寸、碳化物析出情况及强韧性的影响，并对其变体的分布及组合方式进行了分析.结果表明:随着回火温度的升高，实验钢强度逐渐降低，塑性逐渐提高;450T和500T钢断口为准解理型断裂，贝氏体板条间析出的碳化物及较低比例的大角度晶界使得冲击韧性较差;而600T和650T钢断口为韧窝断裂，组织中大角度晶界的比例增加，有效地阻碍了裂纹的扩展.变体分析表明，450T钢变体组合方式介于Bain group和CP(close packed)group之间，而600T钢变体之间呈现较明显的CP组合方式，同一CP group内的变体取向差较大，偏折了裂纹传播路径，提高了低温韧性.

关键词: B-Nb钢, 热轧, 回火, 强韧性, 变体

Abstract: Effects of QT (quenching+tempering) treatment on the proportion of grain boundary， grain size， carbide precipitation， strength and toughness of the tested steels were studied by room-temperature tensile test， pendulum impact test， optical and scanning electron microscopy， and the distribution and combination of the variants were also analyzed. The results show that when the tempering temperature increases， the strength of the tested steels gradually decreases with an increase of plasticity. The fracture modes of 450T and 500T steels are quasi-cleavage fracture， where the impact toughness becomes worse due to the carbides precipitated from bainite laths and the smaller proportion of high-angle grain boundary. The fracture modes of 600T and 650T steels are dimple fracture， where the increased proportion of the high-angle grain boundary hinders the crack propagation more effectively. The variant analysis shows that the variant combination mode of 450T steel is between Bain group and CP (close-packed) group， while that of 600T one tends to be a CP combination mode. The larger misorientation between the variants in the same CP group can deflect the path of crack propagation， which improves the low-temperature toughness.

Key words: B-Nb steel, hot rolling, tempering, strength and toughness, variant

中图分类号:

TG115.5

任家宽，阎冬，陈俊，刘振宇. QT工艺对一种B-Nb低碳贝氏体钢组织及强韧性的影响[J]. 东北大学学报:自然科学版, 2019, 40(11): 1561-1567.

REN Jia-kuan， YAN Dong， CHEN Jun， LIU Zhen-yu. Effect of QT Treatment on Microstructure and Obdurability of a B-Nb Low Carbon Bainite Steel[J]. Journal of Northeastern University Natural Science, 2019, 40(11): 1561-1567.

参考文献

[1]机械行业发展及钢材需求分析［N］.世界金属导报，2014-07-08(B15).(Machinery industry development and steel demand analysis［N］.World Metal Guide，2014-07-08(B15).)
[2]Hu H，Xu G，Wang L，et al.The effects of Nb and Mo addition on transformation and properties in low carbon bainitic steels［J］.Materials & Design，2015，84(4):95-99.
[3]Mao G J，Cao R，Chen J H，et al.In-situ observation of microstructural evolution in reheated low carbon bainite weld metals with various Ni contents［J］.Journal of Iron and Steel Research，International，2017，24(12):1206-1214.
[4]Zhu K，Oberbillig C，Musik C，et al.Effect of B and B+Nb on the bainitic transformation in low carbon steels［J］.Materials Science & Engineering A， 2011，528(12):4222-4231.
[5]Carroll K G，Darken L S，Filer E W，et al.A new iron boro-carbide［J］.Nature，1954，174(4438):978-979.
[6]Watanabe S，Ohtani H.Precipitation behavior of boron in high strength steel［J］.ISIJ International， 1983(23):38-42.
[7]Lin H R，Cheng G H.Analysis of hardenability effect of boron［J］.Materials Science and Technology， 1990，6(8):724-730.
[8]Hara T，Asahi H，Uemori R，et al.Role of combined addition of niobium and boron and of molybdenum and boron on hardnenability in low carbon steels［J］.ISIJ International，2004，44(8):1431-1440.
[9]张杰，蔡庆伍，樊艳秋，等.回火温度对E690海洋用钢组织和显微硬度的影响［J］.材料热处理学，2012，33(4):55-61.(Zhang Jie，Cai Qing-wu，Fan Yan-qiu，et al.Effect of tempering temperature on microstructure and microhardness of an E690 off-shore steel［J］.Transactions of Materials and Heat Treatment，2012，33(4):55-61.)
[10]Zheng Y X，Wang F M，Li C R，et al.Microstructural evolution，coarsening behavior of precipitates and mechanical properties of boron bearing steel 25CrMoNbB during tempering［J］.Materials Science and Engineering A，2018，712:453-465.
[11]Hanamura T，Yin F，Nagai K.Ductile-brittle transition temperature of ultrafine ferrite/cementite microstructure in a low carbon steel controlled by effective grain size［J］.ISIJ International，2004，44(3):610-617.
[12]Shen X J，Tang S，Chen J，et al.Grain refinement in surface layers through deformation-induced ferrite transformation in microalloyed steel plate［J］. Materials & Design，2017，113(5):137-141.
[13]Morris J W.Stronger，tougher steels［J］.Science， 2008，320(5879):1022-1023.
[14]Furuhara T，Maki T.Variant selection in heterogeneous nucleation on defects in diffusional phase transformation and precipitation［J］.Materials Science & Engineering A，2001，312(1/2):145-154.
[15]鲁法云，孟利，杨平，等.高锰钢马氏体相变的晶体学研究［J］.电子显微学报，2009，28(1):23-28.(Lu Fa-yun，Meng Li，Yang Ping，et al.Crystallographic study on martensitic transformation of high manganese steel［J］.Journal of Electron Microscopy，2009，28(1):23-28.)
[16]Furuhara T，Maki T.Variant selection in heterogeneous nucleation on defects in diffusional phase transformation and precipitation［J］.Materials Science and Engineering A，2001，312(1):145-154.
[17]张美汉，许为宗，郭正洪，等.EBSD在马氏体变体间位向关系测定中的应用［J］.电子显微学报，2010，29(1):63-68.(Zhang Mei-han，Xu Wei-zong，Guo Zheng-hong，et al.Application of EBSD in the determination of the orientation relationship between martensitic variants ［J］.Journal of Electron Microscopy，2010，29(1):63-68.)
[18]Takayama N，Miyamoto G，Furuhara T.Effects of transformation temperature on variant grouping of bainitic ferrite in low carbon steel［J］.Acta Materialia，2012，60(5):2387-2396.

QT工艺对一种B-Nb低碳贝氏体钢组织及强韧性的影响

Effect of QT Treatment on Microstructure and Obdurability of a B-Nb Low Carbon Bainite Steel

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