Research on Prediction Method of Liquation Cracking Susceptibility to Magnesium Alloy Welds

doi:10.11900/0412.1961.2018.00151

Acta Metall Sin

2018, Vol. 54

Issue (12): 1735-1744 DOI: 10.11900/0412.1961.2018.00151

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Research on Prediction Method of Liquation Cracking Susceptibility to Magnesium Alloy Welds

Shujun CHEN, Xuan WANG, Tao YUAN(

), Xiaoxu LI

Engineering Research Center of Advanced Manufacturing Technology for Automotive Components, Ministry of Education, Beijing University of Technology, Beijing 100124, China

Cite this article:

Shujun CHEN, Xuan WANG, Tao YUAN, Xiaoxu LI. Research on Prediction Method of Liquation Cracking Susceptibility to Magnesium Alloy Welds. Acta Metall Sin, 2018, 54(12): 1735-1744.

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Abstract

Magnesium alloys has a wide application prospect due to their good properties, such as high specific strength and specific stiffness, but the susceptibility of liquation cracking is also pretty high. The liquation in partially melted zone of AZ-series magnesium alloys were investigated with circular-patch welding test. The AZ91, AZ31 base alloys were welded with AZ61 and AZ92 filler wires by using the cold metal transter metal inert-gas (CMT-MIG) welding. The results show that, the liquation occurred along the weld edge of AZ91 with the eutectic reaction occurring between γ (Mg₁₇Al₁₂) phase and Mg-rich phase. The liquation susceptibility of AZ31 was pretty low as γ (Mg₁₇Al₁₂) was not present in base metal of AZ31. Meanwhile, a new method for predicting liquation cracking based on binary phase diagram was proposed. When the initial solidification temperature of weld is higher and the solidification temperature range of weld is shorter than those of base metal, the liquation crack susceptibility of weld is mostly higher. When the initial solidification temperature of weld is close to or below that of base metal, and the solidification temperature range of weld is close to or longer than that of base metal, the liquation cracking susceptibility of weld is lower. This method worked well on predicting the effect of composition of base metal and filler wires on liquation cracking, and the predicting results are consistent with the experimental results. That is, the liquation cracking susceptibility is higher with AZ91 base metal used than that with AZ31 base metal. And, the liquation cracking susceptibility is lower with AZ92 filler wire than that with AZ61 filler wire.

Key words: magnesium alloy CMT-MIG welding liquation cracking susceptibility prediction chemical composition

Received: 19 April 2018

ZTFLH:

TG401

Fund: Supported by National Natural Science Foundation of China (No.51704013), Beijing Municipal Education Commission General Research Project (No.KM201810005016) and China Postdoctoral Science Foundation (No.2016M600881)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00151 OR https://www.ams.org.cn/EN/Y2018/V54/I12/1735

Fig.1 Circular-patch welding experimental setup showing dimension of workpiece and patch (a) and vertical cross-section of the apparatus (b)

Table 1 Nominal compositions of materials used for welding (mass fraction / %)

Fig.2 Workpiece (outer piece) and patch (inner piece) used for circular-patch welding from top view (a) and bottom view (b)

Table 2 Experimental conditions in circular-patch welding

Fig.3 Transverse microstructures and EDS of weld #3 including OM image (a), magnified image of zone I in Fig.3a (b), SEM image of zone II in Fig.3a (c), SEM image of zone III in Fig.3a of partially melted zone (d) and EDS of the points in Figs.3c and d (e)

Fig.4 Transverse microstructures and EDS of weld #1 including OM image (a), SEM image of zone I in Fig.4a of base metal (b), SEM image of zone II in Fig.4a of partially melted zone (c) and EDS of the points in Figs.4b and c (d)

Fig.5 Schematic showing formation mechanism of liquation cracking (S—solid, L—liquation)

Fig.6 A-B binary phase diagram (I—A-3B, II—A-6B, III—A-9B, T_E—eutectic temperature)

Fig.7 Macrographs of circular-patch welds showing no cracking (a) and 47.8% cracking along the outer edge of the weld (b)

[1]	Froes F H, Eliezer D, Aghion E.The science, technology, and applications of magnesium[J]. JOM, 1998, 50(9): 30
[2]	Ishihara S, Nan Z Y, Goshima T. Effect of microstructure on fatigue behavior of AZ31 magnesium alloy [J]. Mater. Sci. Eng., 2007, A468-470: 214
[3]	Li W, Zhou H, Zhou W, et al.Effect of cooling rate on ignition point of AZ91D-0.98 wt.% Ce magnesium alloy[J]. Mater. Lett., 2007, 61: 2772
[4]	Montemor M F, Sim?es A M, Carmezim M J.Characterization of rare-earth conversion films formed on the AZ31 magnesium alloy and its relation with corrosion protection[J]. Appl. Surf. Sci., 2007, 253: 6922
[5]	Munitz A, Cotler C, Stern A, et al.Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates[J]. Mater. Sci. Eng., 2001, A302: 68
[6]	Rethmeier M, Kleinpeter B, Wohlfahrt H.MIG welding of magnesium alloys metallographic aspects[J]. Weld. World, 2004, 48: 28
[7]	Yu Z H, Yan H G, Yin X Y, et al.Liquation cracking in laser beam welded joint of ZK60 magnesium alloy[J]. Trans. Nonferrous Met. Soc. China, 2012, 22: 2891
[8]	Ma B X, Zhao J X, Wang L P, et al.Research progress of welding hot crack of magnesium alloys[J]. Mater. Rev., 2016, 30(3): 81(马宝霞, 赵建勋, 王丽萍等. 镁合金焊接热裂纹的研究进展[J]. 材料导报, 2016, 30(3): 81)
[9]	Zhou W, Long T Z, Mark C K.Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D[J]. Mater. Sci. Technol., 2007, 23: 1294
[10]	Zhao X X.Liquefaction crack of welding[J]. Machinery, 1981,(11): 19(赵晓星. 焊接液化裂纹 [J]. 机械, 1981, (11): 19)
[11]	Lippold J C, translated by Qu Z X, Zhang H Q, Wang D P. Welding Metallurgy and Weldability [M]. Beijing: Machinery Industry Press, 2017: 34(Lippold J C著, 屈朝霞, 张汉谦, 王东坡译. 焊接冶金与焊接性 [M]. 北京: 机械工业出版社, 2017: 34)
[12]	Huang C, Kou S. Partially melted zone in aluminum welds—Liquation mechanism and directional solidification [J]. Weld. J., 2000, 79: 113-s
[13]	Huang C, Kou S. Liquation cracking in full-penetration Al-Cu welds [J]. Weld. J., 2004, 83: 50-s
[14]	Huang C, Kou S. Liquation cracking in full-penetration Al-Mg-Si welds [J]. Weld. J., 2004, 83: 111-s
[15]	Cao G, Kou S. Predicting and reducing liquation-cracking susceptibility based on temperature vs. fraction solid [J]. Weld. J., 2006, 85: 9-s
[16]	Sun D X.Study on weldability of magnesium alloys (AZ91D and AZ31B) [D]. Changchun: Jilin University, 2008(孙德新. 镁合金(AZ91D、AZ31B)焊接性的研究 [D]. 长春: 吉林大学, 2008)
[17]	Yuan T.Study on welding metallurgy process and microstructure of magnesium welds with the external energy field [D]. Tianjin: Tianjin University, 2016(袁涛. 基于外加能量场的镁合金焊接冶金过程及微观组织研究 [D]. 天津: 天津大学, 2016)
[18]	Yuan T, Chai X, Luo Z, et al.Predicting susceptibility of magnesium alloys to weld-edge cracking[J]. Acta Mater., 2015, 90: 242
[19]	Chai X, Yuan T, Kou S. Liquation and liquation cracking in partially melted zones of magnesium welds [J]. Weld. J., 2016, 95: 57-s
[20]	Yuan T, Luo Z, Liu Y Y.Study on sensitivity of magnesium alloy weld to liquefaction crack[J]. Weld. Technol., 2016, 45(12): 14(袁涛, 罗震, 刘亚云. 镁合金焊缝液化裂纹敏感性研究[J]. 焊接技术, 2016, 45(12): 14)
[21]	Kou S.Welding Metallurgy[M]. 2nd Ed., Hoboken, NJ: John Wiley & Sons, 2003: 301
[22]	Flemings M C.Solidification Processing[M]. New York: McGraw-Hill, 1974: 15
[23]	Kou S, Sun D K.Fluid flow and weld penetration in stationary arc welds[J]. Metall. Trans., 1985, 16A: 203
[24]	Kou S, Wang Y H.Computer simulation of convection in moving arc weld pools[J]. Metall. Trans., 1986, 17A: 2271
[25]	Tsai M C, Kou S.Marangoni convection in weld pools with a free surface[J]. Int. J. Numer. Methods Fluids, 1989, 9: 1503

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