Fatigue Properties of CO<sub>2</sub> Gas Shielded Welded Joint of High Strength and Toughness Medium-Mn Steel

QI Xiangyu; YAN Ling; DU Linxiu; LI Guanglong; ZHANG Peng; WANG Xiaohang

doi:10.11973/jxgccl202207009

Materials and Mechanical Engineering > 2022 > 46(7): 47-50,56. > DOI: 10.11973/jxgccl202207009

QI Xiangyu, YAN Ling, DU Linxiu, LI Guanglong, ZHANG Peng, WANG Xiaohang. Fatigue Properties of CO₂ Gas Shielded Welded Joint of High Strength and Toughness Medium-Mn Steel[J]. Materials and Mechanical Engineering, 2022, 46(7): 47-50,56. DOI: 10.11973/jxgccl202207009

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Fatigue Properties of CO₂ Gas Shielded Welded Joint of High Strength and Toughness Medium-Mn Steel

1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China;
2. Iron and Steel Research Institute of Angang Group, Anshan 114009, China;
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

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Received Date: April 01, 2021
Revised Date: May 06, 2022

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Abstract

The butt welding test of 30 mm thick high strength and toughness medium-Mn steel plate was carried out by CO₂ gas shielded welding. The stress amplitude-life curves of medium-Mn steel welded joints were obtained by round bar tensile and compressive fatigue test. The high cycle fatigue limit was measured and its fracture morphology was observed. The results show that the high cycle fatigue limit of medium-Mn steel welded joint was 353 MPa at stress ratio of -1 and 10⁷ cycles. When obvious welding defects existed in the medium-Mn steel welded joint, the fatigue crack initiated at the microscopic defects. When no welding defects existed in the weld, the fatigue crack initiated at the fusion line of the sample surface. The surface of the fatigue crack propagation zone was rough, and obvious secondary cracks existed. There were a large number of uniform and fine dimples on the surface of the transient fracture area.
- medium-Mn steel,
- CO₂ gas shielded welded joint,
- high-cycle fatigue,
- fatigue limit,
- fatigue fracture

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[1]	LIU H, DU L X, HU J, et al. Interplay between reversed austenite and plastic deformation in a directly quenched and intercritically annealed 0.04C-5Mn low-Al steel[J]. Journal of Alloys and Compounds, 2017, 695:2072-2082.
[2]	齐祥羽,董营,胡军,等.高强韧低碳中锰钢的弯曲疲劳性能[J].东北大学学报(自然科学版),2018,39(12):1712-1716. QI X Y,DONG Y,HU J,et al.Bending fatigue property of low-C medium-Mn steel with high strength and toughness[J]. Journal of Northeastern University (Natural Science),2018,39(12):1712-1716.
[3]	HU J, DU L X, SUN G S, et al. The determining role of reversed austenite in enhancing toughness of a novel ultra-low carbon medium manganese high strength steel[J]. Scripta Materialia, 2015, 104:87-90.
[4]	SUN C, LIU S L, MISRA R D K. et al. Inuence of intercritical tempering temperature on impact toughness of a quenched and tempered medium-Mn steel:Intercritical tempering versus traditional tempering[J]. Materials Science and Engineering:A, 2018, 711:484-491.
[5]	HU J, DU L X, XU W, et al. Ensuring combination of strength, ductility and toughness in medium-manganese steel through optimization of nano-scale metastable austenite[J]. Materials Characterization, 2018, 136:20-28.
[6]	QI X Y, DU L X, HU J, et al. Enhanced impact toughness of heat affected zone in gas shield arc weld joint of low-C medium-Mn high strength steel by post-weld heat treatment[J]. Steel Research International, 2018, 89:1-8.
[7]	中国机械工程学会焊接学会. 焊接手册[M]. 北京:机械工业出版社, 2007. Welding Society of China Mechanical Engineering Society. Welding handbook[M]. Beijing:China Machine Press, 2007.
[8]	齐祥羽,朱晓雷,胡军,等.低碳中锰Q690F高强韧中厚板生产技术[J].东北大学学报(自然科学版),2019,40(4):483-487. QI X Y,ZHU X L,HU J,et al.Production technology of low-C medium-Mn Q690F high strength and toughness mid-thick steel plate[J]. Journal of Northeastern University (Natural Science),2019,40(4):483-487.
[9]	钟群鹏,赵子华.断口学[M].北京:高等教育出版社,2006. ZHONG Q P,ZHAO Z H. Fractography[M].Beijing:Higher Education Press,2006.
[10]	HAN J,NAM J H,LEE Y K.The mechanism of hydrogen embrittlement in intercritically annealed medium Mn TRIP steel[J].Acta Materialia,2016,113:1-10.
[11]	QI X Y, DU L X, HU J, et al. High-cycle fatigue behavior of low-C medium-Mn high strength steel with austenite-martensite submicron-sized lath-like structure[J]. Materials Science and Engineering:A, 2018, 718:477-482.
[12]	齐祥羽. 高强中锰钢焊接热循环下的组织性能与断裂行为[D]. 沈阳:东北大学, 2019. QI X Y. Microstructure and properties of high strength medium manganese steel under welding thermal cycle and its fracture behavior[D]. Shenyang:Northeastern University, 2019.
[13]	霍立兴.焊接结构的断裂行为及评定[M].北京:机械工业出版社,2000. HUO L X. Fracture behavior and evaluation of welded structures[M].Beijing:China Machine Press,2000.
[14]	XU W,WESTERBAAN D,NAYAK S S,et al.Tensile and fatigue properties of fiber laser welded high strength low alloy and DP980 dual-phase steel joints[J].Materials and Design,2012,43:373-383.
[15]	BUSSU G,IRVING P E.The role of residual stress and heat affected zone properties on fatigue crack propagation in friction stir welded 2024-T351 aluminium joints[J]. International Journal of Fatigue,2003,25(1):77-88.
[16]	MA N S, CAI Z P, HUANG H, et al. Investigation of welding residual stress in flash-butt joint of U71Mn rail steel by numerical simulation and experiment[J]. Materials and Design, 2015, 88(25):1296-1309.
[17]	CHENG X H,FISHER J W,PRASK H J,et al.Residual stress modification by post-weld treatment and its beneficial effect on fatigue strength of welded structures[J]. International Journal of Fatigue,2003,25(9/10/11):1259-1269.

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Fatigue Properties of CO2 Gas Shielded Welded Joint of High Strength and Toughness Medium-Mn Steel

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Fatigue Properties of CO₂ Gas Shielded Welded Joint of High Strength and Toughness Medium-Mn Steel