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材料工程  2015 

800MPa级高强钢焊接粗晶区再热循环的组织转变规律

DOI: 10.11868/j.issn.1001-4381.2015.07.016, PP. 93-99

Keywords: 低合金高强钢,焊接热循环,马氏体,贝氏体

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Abstract:

为了研究800MPa级低合金高强钢焊接粗晶区的组织转变规律,采用热模拟的方法,应用L78RITA相变热膨胀仪模拟了实验用钢的两次焊接热循环过程,对应的焊接线能量约为20kJ/cm.建立了该钢的奥氏体连续加热转变曲线(TTA),并对组织、硬度和热膨胀曲线进行分析,结果显示,实验用钢一次热循环粗晶区组织为板条马氏体和贝氏体,硬度为318HV,当第二次热循环峰值温度(Tp2)为1000℃时,第一次热循环后的组织发生完全重结晶,得到细小的贝氏体组织,硬度下降,当Tp2为900℃时发生部分重结晶,硬度最低(239HV),当Tp2为800℃时,在晶界和晶内相界生成链状分布的M-A组元,而Tp2小于A'c1时发生回火作用,M-A组元分解并析出碳化物.实验用钢的热影响区未出现组织遗传现象,因此为了更准确判断组织转变类型,应结合TTA曲线对焊接热影响区组织转变进行分析.

References

[1]  翁宇庆,杨才福,尚成嘉. 低合金钢在中国的发展现状与趋势[J]. 钢铁,2011,46(9):1-9. WENG Yu-qing, YANG Cai-fu, SHANG Cheng-jia. State of the art and development trends of HSLA steels in China[J]. Iron and Steel, 2011, 46(9):1-9.
[2]  BONNEVIEA E, FERRIERE G, IKHLEF A, et al. Morphological aspects of martensite-austenite constituents in intercritical and coarse grain heat affected zones of structural steels[J]. Materials Science and Engineering: A, 2004, 385(1-2): 352-358.
[3]  BAYRAKTAR E, KAPLAN D. Mechanical and metallurgical investigation of martensite-austenite constituents in simulated welding conditions[J]. Journal of Materials Processing Technology, 2004,153-154: 87-92.
[4]  MOEINIFAR S, KOKABI A H, MADAAH H H R. Influence of peak temperature during simulation and real thermal cycles on microstructure and fracture properties of the reheated zones[J]. Materials and Design, 2010, 32(6): 2948-2955.
[5]  MOEINIFAR S, KOKABI A H, MADAAH H H R. Effect of tandem submerged arc welding process and parameters of gleeble simulator thermal cycles on properties of the intercritically reheated heat affected zone[J]. Materials and Design, 2011, 32(2): 869-876.
[6]  LIAO J S,IKEUCHI K J, MATSUDA F. Toughness investigation on simulated weld HAZs of SQV-2A pressure vessel steel[J]. Nuclear Engineering and Design, 1998, 183(1-2): 9-20.
[7]  陆雪冬,岑越,王欢,等. 多层多道焊接DH40船用钢接头组织及力学性能[J]. 焊接学报,2013,34(2):79-83. LU Xue-dong, CEN Yue, WANG Huan, et al.Structure and mechanical properties on DH40 ship building steel joints by multi-layer and multi-pass welding technology[J]. Transactions of the China Welding Institution, 2013, 34(2):79-83.
[8]  许良红,陈延清,章军,等. 焊接热循环对07MnCrMoVR钢热影响区组织及韧性的影响[J]. 钢铁,2011,46(2):62-68. XU Liang-hong, CHEN Yan-qing, ZHANG Jun, et al.Effect of thermal cycle on microstructure and mechanical properties of heat affected zone of 07MnCrMoVR steel[J]. Iron and Steel, 2011, 46(2):62-68.
[9]  彭冀湘,张田宏,杜义,等. 二次焊接热循环对超高强度钢过热区冲击性能的影响[J]. 材料开发与应用,2006,21(3):23-25. PENG Ji-xiang, ZHANG Tian-hong, DU Yi, et al.Effect of secondary welding thermal cycles on microstructure and toughness of over-heated zone of ultrahigh strength steel[J]. Development and Application of Materials, 2006, 21(3):23-25.
[10]  高惠临,董玉华. 超低碳QT钢焊接二次热循环的组织转变与局部脆化[J]. 金属学报, 2001,37(1):34-38. GAO Hui-lin, DONG Yu-hua.Microstructure transformation and brittlement of a ultra-low carbon QT steel during double welding thermal cycle[J]. Acta Metallurgica Sinica, 2001, 37(1):34-38.
[11]  LAMBERT P A, GOURGUES A F, PINEAU A. Austenite to bainite phase transformation in the heat-affected zone[J]. Acta Materialia, 2004, 52(8): 2337-2348.
[12]  林慧国,傅代直. 钢的奥氏体曲线转变-原理、测试与应用[M]. 北京:机械工业出版社,1988. 247-248. LIN Hui-guo, FU Dai-zhi. Austenite Transformation Curve of Steel-Theory, Testing and Application [M]. Beijing: China Machine Press, 1988. 247-248.
[13]  董露,张骁勇,徐学利,等. 二次焊接热循环中X100管线钢粗晶区组织性能研究[J]. 热加工工艺,2012,41(23):150-153. DONG Lu, ZHANG Xiao-yong, XU Xue-li, et al. Microstructure and properties of coarse grain heat affected zone in second welding thermal cycle of X100 pipeline steel[J]. Hot Working Technology, 2012, 41(23):150-153.

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