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Anomalous residual austenite formation in root of welding layers of 9% Cr/CrMoV dissimilar welded joint |
Kai Ding1 Hui-jun Ji1 Quan-liang Zhang1 Xia Liu2 ? Peng Wang2 Xiao-hong Li1 Ling Zhang1 Yu-lai Gao1 |
1 State Key Laboratory of Advanced Special Steel State, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China 2 Shanghai Turbine Plant, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China |
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Abstract The morphology and distribution of residual austenite in the welded zone of 9% Cr/CrMoV dissimilar welded joint were observed by color metallographic method. Moreover, the details of the distribution, shape, length, length-to-width ratio, and the content of residual austenite in each welding layer were systematically characterized using Image-Pro Plus image analysis software. Different from the techniques such as X-ray diffraction, vibrating sample magnetometer, and electron backscatter diffraction that only involve the content of residual austenite, color metallographic method can offer much more details of the residual austenite, including the location, shape, size, and content, helping evaluate the overall characteristics of the residual austenite produced in the weld. It is interesting that a large amount of block-like and film-like residual austenite was found in the root of each welding layer, while rare at the top. The area fraction of residual austenite located in this zone was approximately 7.5% compared with only 0.5% at the top. In addition, the average area, length, and length-to-width ratio of dispersed residual austenite were quantitatively evaluated to be (4.7 ± 0.6) lm2, (5.1 ± 0.6) lm, and (1.1 ± 0.1) lm, respectively. This variety of residual austenite was resulted from the tempering effect by latter welding layer on the previous one and different cooling rates in these two regions during the welding process.
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Received: 01 September 2017
Published: 31 October 2018
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Cite this article: |
KAI -Ding,HUIJUN -Ji,QUANLIANG -Zhang, et al. Anomalous residual austenite formation in root of welding layers of 9% Cr/CrMoV dissimilar welded joint[J]. Journal of Iron and Steel Research International, 2018, 25(8): 839-846.
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[1] |
Yang Yuehui, Cai Qingwu, Tang Di, Wu Huibin. Precipitation and stability of reversed austenite in 9Ni steel [J]. International Journal of Minerals, Metallurgy and Materials, 2010, 17 (5): 587-595.
|
[2] |
Liu Peng, Lu Fenggui, Liu Xia, Ji Huijun, Gao Yulai. Study on fatigue property and microstructure characteristics of welded nuclear power rotor with heavy section [J]. Journal of Alloys and Compounds, 2014, 584 (25): 430-437.
|
[3] |
Wu Qingjun, Lu Fenggui, Cui Haichao, Liu Xia, Wang Peng, Gao Yulai. Soft zone formation by carbon migration and its effect on the high-cycle fatigue in 9%Cr-CrMoV dissimilar welded joint [J]. Materials Letters, 2015, 141 (15): 242-244.
|
[4] |
Amini Kamran, Nategh Said, Shafyei Ali, Rezaeian Ahmad. Effect of deep cryogenic treatment on the properties of 80CrMo12 5 tool steel [J]. International Journal of Minerals, Metallurgy and Materials, 2012, 19 (1): 30-37.
|
[5] |
Hao Qingguo, Qin Shengwei, Liu Yu, Zuo Xunwei, Chen Nailu, Huang Wen, Rong Yonghua. Effect of retained austenite on the dynamic tensile behavior of a novel quenching-partitioning-tempering martensitic steel [J]. Materials Science and Engineering A, 2016, 662 (26): 16-25.
|
[6] |
Zhang Mingya, Zhu Fuxian, Zheng Dongsheng. Mechanical properties and retained austenite transformation mechanism of TRIP-aided polygonal ferrite matrix seamless steel tube [J]. Journal of Iron and Steel Research, International, 2011, 18 (8): 73-78.
|
[7] |
Zou Dening, Han Ying, Zhang Wei, Fang Xudong. Influence of tempering process on mechanical properties of 00Cr13Ni4Mo supermartensitic stainless steel [J]. Journal of Iron and Steel Research, International, 2010, 17 (8): 50-54.
|
[8] |
Akhharizadeh A, Golozar MA, Shafeie A, Kholghy M. Effects of austenizing time on wear behavior of D6 tool steel after deep cryogenic treatment [J]. Journal of Iron and Steel Research, International, 2009, 16 (6): 29-32.
|
[9] |
Galindo-Nava EI, Rivera-Díaz-del-Castillo PEJ. A model for the microstructure behaviour and strength evolution in lath martensite [J]. Acta Materialia, 2015, 98 (1): 81-93.
|
[10] |
Zhou Qian, Qian Lihe, Tan Jun, Meng Jiangying, Zhang Fucheng. Inconsistent effects of mechanical stability of retained austenite on ductility and toughness of transformation-induced plasticity steels [J]. Materials Science and Engineering A, 2013, 578 (33): 370-376.
|
[11] |
Timokhina IB, Hodgson PD, Pereloma EV. Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels [J]. Metallurgical and Materials Transactions A, 2004, 35 (8): 2331-2341.
|
[12] |
Jiang Haitao, Wu Hubin, Tang Di, Liu Qiang. Influence of isothermal bainitic processing on the mechanical properties and microstructure characterization of TRIP steel [J]. International Journal of Minerals, Metallurgy and Materials, 2008, 15 (5): 574-579.
|
[13] |
Zhao L, Dijk NH van, Brück E, Sietsma J, Zwaag S van der. Magnetic and X-ray diffraction measurements for the determination of retained austenite in TRIP steels [J]. Materials Science and Engineering A, 2001, 313 (1-2): 145-152.
|
[14] |
Qu Yuebo, Huang Xinquan, Cao Bin, Cai Zhipeng, Pan Jiluan. Effect of residual austenite content on impact toughness of the filler metal of 2.25Cr-1Mo steel [J]. Journal of Mechanical Engineering, 2011, 14 (47): 44-48.
|
[15] |
Chen Guoan, Yang Wangyue, Guo Shouzhen, Sun Zuqing. Characteristics of microstructural evolution during deformation-enhanced ferrite transformation in Nb-microalloyed HSLA steel [J]. International Journal of Minerals, Metallurgy andMaterials, 2007, 14 (1): 36-40.
|
[16] |
Lambert-Perlade A, Gourgues AF, Pineau A. Austenite to bainite phase transformation in the heat-affected zone of a high strength low alloy steel [J]. Acta Materialia, 2004, 52 (8): 2337-2348.
|
[17] |
Lee Chang Gil, Kim Sung-Joon, Lee Tae-Ho, Lee Sunghak. Effects of volume fraction and stability of retained austenite on formability in a 0.1C-1.5Si-1.5Mn-0.5Cu TRIP-aided cold-rolled steel sheet [J]. Materials Science and Engineering A, 2004, 371 (1-2): 16-23.
|
[18] |
Varshney A, Sangal S, Kundu S, Mondal K. Superior work hardening behavior of moderately high carbon low alloy super strong and ductile multiphase steels with dispersed retained austenite [J]. Materials and Design, 2016, 99 (5): 439-448.
|
[19] |
Shen YF, Qiu LN, Sun X, Zuo L, Liaw PK, Raabe D. Effects of retained austenite volume fraction, morphology, and carbon content on strength and ductility of nanostructured TRIP-assisted steels [J]. Materials Science and Engineering A, 2015, 636 (4): 551-564.
|
[20] |
Ray A, Dhua SK. Microstructural manifestations in color: Some applications for steels [J]. Materials Characterization, 1996, 37 (1): 1-8.
|
[21] |
O?oro J. Weld metal microstructure analysis of 9-12% Cr steels [J]. International Journal of Pressure Vessels and Piping, 2006, 83 (7): 540-545.
|
[22] |
Liu Xia, Ji Huijun, Liu Peng, Wang Peng, Lu Fenggui, Gao Yulai. Characterization of the structural details of residual austenite in the weld metal of a 9Cr1MoNbV welded rotor [J]. International Journal of Minerals, Metallurgy and Materials, 2014, 21 (6): 563-568.
|
[23] |
Liu Peng, Lu Fenggui, Liu Xia, Gao Yulai. Metallographic etching and microstructure characterization of NiCrMoV rotor steels for nuclear power [J]. International Journal of Minerals, Metallurgy andMaterials, 2013, 20 (12): 1164-1169.
|
[24] |
Wu Qingjun, Lu Fenggui, Cui Haichao, Liu Xia, Wang Peng, Tang Xinhua. Role of butter layer in low-cycle fatigue behavior of modified 9Cr and CrMoV dissimilar rotor welded joint [J]. Materials and Design, 2014, 59 (7): 165-175.
|
[25] |
Furuya Kazuyuki, Ida Mizuho, Miyashita Makoto, Nakamura Hiroo. Mechanical properties of F82H/316L and 316L/316L welds upon the target back-plate of IFMIF [J]. Journal of Nuclear Materials, 2009, 386-388 (5): 963-966.
|
[26] |
Chang Ying, Meng ZhaoHuan, Ying Liang, Li XiaoDong, Ma Ning, Hu Ping. Influence of hot press forming techniques on properties of vehicle high strength steels [J]. Journal of Iron and Steel Research, International, 2011, 18 (5): 59-63.
|
[27] |
Lin Jianping, Min Junying, Ye You, Xin Lijiu, Ding Lei. Investigation on the mechanical properties at room temperature of Q and P steel sheet with ultrahigh strength [J]. Journal of Iron and Steel Research, International, 2011, 18 (S1): 851-854
|
[1] |
Kai Ding Hui-jun Ji Xia Liu Peng Wang Quan-liang Zhang Xiao-hong Li Yu-lai Gao. Prevention of carbon migration in 9% Cr/CrMoV dissimilar welded joint by adding tungsten inert gas overlaying layer[J]. , 2018, 25(8): 847-853. |
[2] |
MIN Yong-an,ZHOU Quan,LUO Yi,LI Dan, WU Xiao-chun. Tempering Process to Improve Hardness Uniformity of Plastic Mould Steel[J]. Chinese Journal of Iron and Steel, 2012, 19(12): 53-58. |
[3] |
YANG Gang;et al. Embrittlement Mechanism due to Slow Cooling During Quenching for M152 Martensitic Heat Resistant Steel[J]. Chinese Journal of Iron and Steel, 2010, 17(6): 60-66. |
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