通过预涂覆SiC优化AZ31B镁合金DE-GMAW焊缝的显微组织及提升力学性能<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.018

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Abstract The effects of SiC coating on weld seam's macro-morphology, microstructure and mechanical properties of double-electrode gas metal arc welded (DE-GMAW) 2 mm thick AZ31B magnesium alloy were investigated. The microstructure, phase and phase composition of the weld seams were observed by optical and scanning microscope, X-ray diffraction, micro hardness test and tensile tests. The results showed that the penetration and the depth/width (D/W) ratio of the weld seam increased at first and then decreased with the increasing amount of the SiC coating. The results of the XRD analysis showed that the addition of SiC could not change the types of phases in the weld seam, it contained α-Mg and β-Mg₁₇Al₁₂. The effects of SiC were refining grain sizes and interrupting the β-Mg₁₇Al₁₂ phase in the weld seam, this interruption had dispersion strengthening effect. But when the amount of SiC reached a certain value, the α-Mg grains coarsened with the increasing SiC amount and the dispersion strengthening effect of the β-Mg₁₇Al₁₂ phase would no longer increase. The microhardness and ultimate tensile strength of the seams increased at first and then decreased with the increasing amount of coated SiC.

Key words： SiC AZ31B magnesium alloy double-electrode gas metal arc welding microstructure mechanical property

Published: 25 October 2017 Online: 2018-05-05

CLC number:

TG444+.2

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	CHEN Peng
	MA Guohong
	PING Qiwen

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CHEN Peng,MA Guohong,PING Qiwen. Improved Microstructure and Promoted Mechanical Properties of DE-GMAW Weld Seam of AZ31B Magnesium Alloy by Pre-coating SiC[J]. Materials Reports, 2017, 31(20): 82-86.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.018 OR https://www.mater-rep.com/EN/Y2017/V31/I20/82

1 Shen J, Wen L, Li Y, et al. Effects of welding speed on the microstructures and mechanical properties of laser welded AZ61 magne-sium alloy joints[J]. Mater Sci Eng A, 2013,578(3):303.
2 Yu K, Li W X, Wang R C, et al. Research, development and application of wrought magnesium alloys[J]. Chin J Nonferrous Metals, 2013, 13(2):277(in Chinese).
余琨, 黎文献, 王日初,等. 变形镁合金的研究、开发及应用[J]. 中国有色金属学报, 2003,13(2):277.
3 Sun D X, Sun D Q, Li J B, et al. Research progress and application of welding technology of magnesium alloys[J]. Mater Rev, 2006; 20(8):122(in Chinese).
孙德新, 孙大千, 李金宝,等. 镁合金焊接技术的研究进展及应用[J]. 材料导报, 2006,20(8):122.
4 Wei H L, Li H, Yang L J, et al. Consumable double electrode with a single arc GMAW[J]. Int J Adv Manuf Technol, 2013,68(5):1539.
5 Wu C S, Hu Z H, Zhong L M. Prevention of humping bead asso- ciated with high welding speed by double-electrode gas metal arc wel-ding[J]. Int J Adv Manuf Technol, 2012,63(5):573.
6 Zhang C, Ma G, Nie J, et al. Numerical simulation of AZ31B magnesium alloy in DE-GMAW welding process[J]. Int J Adv Manuf Technol, 2015,78(5):1259.
7 Shi Y, Wen J X, Xue C, et al. Influence DE-GMAW by-pass current on weld penetration[J]. J Lanzhou University of Technology, 2011,37(1):17(in Chinese).
石圩, 温俊霞, 薛诚,等. DE-GMAW旁路电流对焊缝熔深变化的影响[J]. 兰州理工大学学报, 2011,37(1):17.
8 Günther R, Hartig C, Bormann R. Grain refinement of AZ31 by (SiC) P:Theoretical calculation and experiment[J]. Acta Mater, 2006,54(20):5591.
9 Zhang S, Jiang F, Ding W. Microstructure and mechanical perfor-mance of pulsed current gas tungsten arc surface engineered compo-site coatings on Mg alloy reinforced by SiCp[J]. Mater Sci Eng A, 2008,490(1-2):208.
10Chen T J, Ma Y, Lv W B, et al. Grain refinement of AM60B magnesium alloy by SiC particles[J]. J Mater Sci, 2010,45(24):6732.
11Chen T J, Jiang X D, Ma Y, et al. Grain refinement of AZ91D magnesium alloy by SiC[J]. J Alloys Compd, 2011,14(1):218.
12Huang Y, Kainer K U, Hort N. Mechanism of grain refinement of Mg-Al alloys by SiC inoculation[J]. Scrip Mater, 2011,64(8):793.
13Chen S N, Cai C C, Yu H, et al. Effects of SiC content on refinement efficiency and morphology of AZ91D magnesium alloys[J]. Spec Cast Nonferr Alloys, 2013,33(10):976(in Chinese).
陈胜娜, 蔡长春, 余欢,等. SiC含量对AZ91D镁合金细化效果及组织形貌的影响[J]. 特种铸造及有色合金, 2013,33(10):976.
14Poddar P, Srivastava V C, De P K, et al. Processing and mechanical properties of SiC reinforced cast magnesium matrix composites by stir casting process[J]. Mater Sci Eng A, 2007,460-461(14):357.