Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

doi:10.1007/s40195-016-0402-5

金属学报英文版 ›› 2016, Vol. 29 ›› Issue (5): 414-.DOI: 10.1007/s40195-016-0402-5

所属专题： 2016-2017铝合金专辑

收稿日期:2016-03-22 修回日期:2016-03-22 出版日期:2016-03-22 发布日期:2016-05-10

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Hua-Rui Zhang^1,², Zhen-Bang Liu^1,², Zi-Zhuo Li^1,², Guo-Wei Li³, Hu Zhang^1,²()

1 .School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2. Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology, Beihang University,Beijing 100191, China
3. SMX Dicastal Wheel Manufacture Company,Sanmenxia 472000, China

Received:2016-03-22 Revised:2016-03-22 Online:2016-03-22 Published:2016-05-10

摘要/Abstract

Abstract:

The cooling rate sensitivities of AlTiB, RE and AlTiB-RE refiners were investigated using laboratory experiments and the actual industrial applications of A356 automotive wheel via low pressure die casting technology. Their impact mechanisms on the microstructure and mechanical properties of the A356 alloy were discussed. The results demonstrated that the AlTiB-RE refiner possessed most effective and synergetic refinement effects compared to the individual AlTiB or RE refiners. The AlTiB-RE refiner exhibited the least sensitivity to the cooling rate changes than the other refiners. The comprehensive properties of alloy wheel refined by the AlTiB-RE refiner were improved significantly. The tensile strength, yield strength, and elongation of wheel spoke improved by approximately 11.3%, 10.8% and 44.1%, respectively. The property difference values of the tensile strength, yield strength, and elongation in different positions of the wheel decreased from 14.8%, 31.2% and 47.7% to 8.6%, 27.1% and 30.9%, respectively.

Key words: Grain refinement, Cooling rate sensitivity, A356 alloy, Microstructure, Mechanical properties

. [J]. 金属学报英文版, 2016, 29(5): 414-.

Hua-Rui Zhang, Zhen-Bang Liu, Zi-Zhuo Li, Guo-Wei Li, Hu Zhang. Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(5): 414-.

图/表 11

Table 1 Chemical composition of A356 alloys (wt%)

Si	Mg	Ti	Sr	Fe	Cu	Mn	Zn	Ga	Al
7.19	0.263	0.112	0.0146	0.111	\0.001	0.007	\0.001	0.0111	Bal.

Fig. 1 a Schematic of taper-shaped graphite mold and thermocouple positions; b Cooling curves of different sections with various diameters in the mold. The inset further reveals the measured average cooling rates

Fig. 2 Positions on the hub, spoke, and the rim regions from where the samples were taken

Fig. 3 Typical optical micrographs of the samples without and with grain refiners at 3 °C/s: a without refiners; b 0.3 wt% AlTiB; c 0.3 wt% RE; d 0.3 wt% AlTiB-RE

Fig. 4 Average grain size with varying refiner contents and varying cooling conditions: a 1.5 °C/s; b 3 °C/s; c 17 °C/s; d 32 °C/s

Fig. 5 a Typical average grain size as a function of the cooling rate for the samples without a refiner and the samples with the addition of different refiners. The addition concentration was 0.3 wt% for each refiner; b Refining effect of different refiners as a function of the cooling rate

Fig. 6 Average grain sizes of different sections of the wheel made of A356 alloy with an addition of AlTiB-RE and conventional AlTiB refiners

Fig. 7 Microstructure of different sections of the A356 alloy wheel with the addition of AlTiB and AlTiB-RE refiners: a spoke with the addition of the AlTiB refiner; b spoke with the addition of the AlTiB-0.11% RE refiner; c spoke with the addition of the AlTiB-0.16% RE refiner; d inner rim with the addition of the AlTiB refiner; e inner rim with the addition of the AlTiB-0.11% RE refiner; f a typical higher magnification of e

Fig. 8 Mechanical properties of the A356 alloy wheel with different refiners

参考文献 22

[1]	M. Zhu, Z.Y. Jian, G.C. Yang, Y.H. Zhou, Mater. Des. 36, 243(2012)
[2]	Q. Liu, H. Zhang, Y.X. Cui, Q.C. Li, Scr. Mater. 25, 371(1991)
[3]	H.R. Sergio, E.G. Rafael, K.D. Dheerendra, H.B. Vı´ctor, F.Z.Horacio, J.P.L. Mater. Des. 32, 1865(2011)
[4]	C.W. Liao, J.C. Chen, Y. Li, R. Tu, C.X. Pan, J. Mater. Sci.Technol. 28, 524(2012)
[5]	Y.F. Han, K. Li, J. Wang, D. Shu, B.D. Sun, Mater. Sci. Eng. A 405, 306 (2005)
[6]	M. Nowak, L. Bolzoni, B.N. Hari, Mater. Des. 66, 366(2015)
[7]	W. Schneider, M.A. Kearns, M.J.McGarry, A.J. Whitehead, in A Comparison of the Behaviour of AlTiB and AlTiC Grain Refiners, Light Metals, ed. by B.J.Welch(Warrendale, PA:TMS , 1998), pp. 953-961
[8]	A.L. Greer, A.M. Bunn, A. Tronche, Acta Mater. 48, 2823(2000)
[9]	Q.Y. Xu, Y.J. Chen, T.Y. Huang, Chinese Patent ZL200610011786.2 May 2009
[10]	K. Wang, C.X. Cui, Q. Wang, S.J. Liu, C.S. Gu, Mater. Lett. 85,153(2012)
[11]	K. Wang, C.X. Cui, Q. Wang, L.C. Zhao, Y. Hu, J. Rare Earths 31, 313 (2013)
[12]	O.E. Sebaie, A.M. Samuel, F.H. Samuel, H.W. Doty, Mater. Sci.Eng. A 480, 342 (2008)
[13]	J.H. Li, X.D. Wang, T.H. Ludwig, Y. Tsunekawa, L. Arnberg,J.Z. Jiang, P. Schumacher, Acta Mater. 84, 153(2015)
[14]	W.M. Jiang, Z.T. Fan, Y.C. Dai, C. Li, Mater. Sci. Eng. A 597,237 (2014)
[15]	Y.C. Tsai, C.Y. Chou, S.L. Lee, C.K. Lin, J.C. Lin, S.W. Lim, J.Alloys Compd. 487, 157(2009)
[16]	V. Raghavan, J. Phase Equilibria Diffus. 28, 456(2007)
[17]	L.Y. Zhang, Y.H. Jiang, Z. Ma, S.F. Shan, Y.Z. Jia, C.Z. Fan,W.K. Wang, J. Mater. Process. Technol. 207, 107(2008)
[18]	A. Abedi, M. Shahmiri, B.A. Esgandari, B. Nami, J. Mater. Sci.Technol. 29, 971(2013)
[19]	B.S. Murty, S.A. Kori, M. Chakraborty, Int. Mater. Rev. 47, 3(2002)
[20]	C.L. Xu, Q.C. Jiang, Mater. Sci. Eng. A 437, 451 (2006)
[21]	H.L. Zhao, Y. Song, M. Li, S.K. Guan, J. Alloys Compd. 508,206(2010)
[22]	Z.M. Shi, Q. Wang, G. Zhao, R.Y. Zhang, Mater. Sci. Eng. A 626, 102 (2015)

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

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