线能量对Ti-Mg脱氧EH420钢热影响区组织和低温冲击性能的影响
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摘要
研究了不同线能量输入对EH420钢焊接热影响区组织及低温冲击性能的影响。利用真空感应炉和TMCP轧制工艺制备EH420试验钢板,利用Gleeble-3800型动态热模拟试验机对试样进行焊接热模拟试验,利用拉伸试验机和冲击试验机对母材和焊后模拟试样进行力学性能检测,利用光学显微镜对试样进行金相观察。结果表明:采用Ti-Mg复合脱氧的氧化物冶金技术和TMCP轧制工艺制备的钢板具有良好的大线能量焊接性能;Ti-Mg-O粒子促使焊接热影响区生成大量的针状铁素体,从而改善其低温冲击性能;随着线能量的增加,原奥氏体尺寸增大,晶界铁素体逐渐增多,魏氏体含量先增加后减少,魏氏体晶粒尺寸增大, HAZ低温冲击吸收功呈下降趋势。
The effects of different heat input on the microstructure and low temperature impact properties of the heat affected zone(HAZ) of EH420 steel were studied. The test steel plate was manufactureed by vacuum induction furnace and TMCP rolling process. The welding thermal simulation tests were carried out by using the Gleeble-3800 dynamic thermal simulation test machine. The mechanical properties of the base metal and post-weld simulated samples were tested by tensile testing machine and impact tester. The metallographic observation was carried out by using optical microscope. The results show that the steel plate prepared by using Ti-Mg compound deoxidization and TMCP rolling process has excellent welding performance of high heat input welding. In the heat affected zone, a large number of acicular ferrite is formed because of Ti-Mg-O particles, which improves the low temperature impact properties. With the increase of heat input, the original austenite size increases, the ferrite at grain boundary increases gradually, the Widmanstaten content first increases and then decreases, the size of the Widmanstatten increases. Therefore, the low temperature impact absorbing energy of the HAZ decreases.
The effects of different heat input on the microstructure and low temperature impact properties of the heat affected zone(HAZ) of EH420 steel were studied. The test steel plate was manufactureed by vacuum induction furnace and TMCP rolling process. The welding thermal simulation tests were carried out by using the Gleeble-3800 dynamic thermal simulation test machine. The mechanical properties of the base metal and post-weld simulated samples were tested by tensile testing machine and impact tester. The metallographic observation was carried out by using optical microscope. The results show that the steel plate prepared by using Ti-Mg compound deoxidization and TMCP rolling process has excellent welding performance of high heat input welding. In the heat affected zone, a large number of acicular ferrite is formed because of Ti-Mg-O particles, which improves the low temperature impact properties. With the increase of heat input, the original austenite size increases, the ferrite at grain boundary increases gradually, the Widmanstaten content first increases and then decreases, the size of the Widmanstatten increases. Therefore, the low temperature impact absorbing energy of the HAZ decreases.
引文
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[10]李安民. 30CrNi2MoV钢的魏氏组织研究[J].热加工工艺,2013,42(6):161-163.
[2] Kanazawa Shogo, Nakashima Akira, Okamoto Kentaro, et al.Improved toughness of weld fussion zone by fine TiN particles and development of a steel for large heat input welding[J].Tetsu-to-Hagane, 1975, 61(11):2589-2603.
[3] Moon Joonoh, Lee Changhee, Uhm Sangho, et al. Coarsensing kinetics of TiN particle in a low alloyed steel in weld HAZ considering critical particle size[J]. Acta Materialia, 2006, 54(4):1053-1061.
[4] Yamamoto Kohichi, Hasegaw Toshiei, Takamura Jin-ichi. Effect of boron on intra-granular ferrite formation in Ti-oxide bearing steels[J]. ISIJ International, 1996, 36(1):80-86.
[5]杨健,祝凯,王睿之,等.利用强脱氧剂改善焊接热影响区韧性的技术(ETISD技术)[C]//洁净钢生产技术国际研讨会.2011.
[6] Kojima Akihiko, Kiyose Akihito, Uemori Ryuji, et al. Super high HAZ toughness technology with fine microstructure imparted by fine particles[R]. Nippon Steel Technical Report,2004, 90:2-6.
[7]刘善宜,张万萍,汪声娟.阶段冷却与魏氏组织的产生[J].物理测试,1984(1):3-5.
[8]余圣甫,石仲堃,李志远等.药芯焊丝焊缝中的夹杂物对针状铁素体形成的影响规律[J].应用科学学报,2000(3):192-197.
[9]黄维刚,徐蓉,方鸿生等.中低碳含硅空冷贝氏体钢的冲击韧性[J].钢铁研究学报,1997(2):35-38.
[10]李安民. 30CrNi2MoV钢的魏氏组织研究[J].热加工工艺,2013,42(6):161-163.
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