Reduction in Liquid Segregation and Microstructure Improvement in a Semisolid Die Casting Process by Varying Injection Velocity

被引：19

作者：

Kim, H. H. ^{[1
]}

Lee, S. M. ^{[1
]}

Kang, C. G. ^{[1
]}

机构：

[1] Pusan Natl Univ, Pusan 609735, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2011年 / 42卷 / 01期

关键词：

DEFORMATION-BEHAVIOR; THIXOFORMING PROCESS; FORMING PROCESS; STRAIN-RATE; ALLOYS; DESIGN;

D O I：

10.1007/s11663-010-9451-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To investigate die filling from a semisolid melt, a die was designed to cast a two-part test sample with restrictions in one part and steps of different thicknesses in the other. Several defect types were observed including surface eutectic segregation, gas holes with eutectic segregation, oxide flaws, and shrinkage porosity. The effect of melt injection velocity on liquid segregation in the cast parts was investigated using macro-microstructural observation and computer simulation. Process parameters to reduce liquid segregation were obtained by computer simulation. The effect of injection speed of the plunger tip on liquid segregation was most significant after the semisolid material had filled the runner. According to experimental and simulation results, liquid segregation could be removed by controlled high plunger speed (more than 0.3m/s).

引用

页码：156 / 170

页数：15

共 35 条

[1] Die life prediction considering thermal fluid flow and solidification phenomenon in rheology process [J].

Bae, J. W. ;

Seol, D. Y. ;

Kang, C. G. ;

Lee, S. M. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 201 (1-3) :336-341

[2]

Callister Jr. W.D., 2003, MAT SCI ENG INTRO, P186

[3] Semi-solid deformation of non-dendritic structures .1. Phenomenological behavior [J].

Chen, CP ;

Tsao, CYA .

ACTA MATERIALIA, 1997, 45 (05) :1955-1968

[4] THIXOFORGING OF ALUMINUM-ALLOYS [J].

CHEN, CY ;

SEKHAR, JA ;

BACKMAN, DG ;

MEHRABIAN, R .

MATERIALS SCIENCE AND ENGINEERING, 1979, 40 (02) :265-272

[5]

Chen Z.W., 1998, P 5 INT C SEM ALL CO, P312

[6]

Chiarmetta, 1996, P 4 INT C SEM PROC A, P204

[7]

Chirmetta G., 1996, P 4 INT C SEM PROC A, P235

[8]

Clauser G.L., 1996, P 4 INT C SEM PROC A, P234

[9]

Fan Z., 2002, INT MATER REV, V43, P548

[10] BEHAVIOR OF METAL-ALLOYS IN THE SEMISOLID STATE [J].

FLEMINGS, MC .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1991, 22 (05) :957-981

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