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HỘI THẢO QUỐC TẾ ATiGB LẦN THỨ CHÍN - The 9 ATiGB 2024 209

85 97 79 100 104 99 110 98
S50C 84 101 79 101 106 101 111 99
85 99 79 100 104 102 113 98
4. CONCLUSIONS
Via conducting experiment with welding
procedures to find out compatibility of filler rods
which can be used in die reparation. Discovering
Fig. 6. Microstructure of weld bead in which P20 compatibility between steel grades, used to make die
steel plate is welded and filled with ER304L cavity and materials of filler rods, which can be used
In the last case of S50C, selected to make die as additive material to refill wear or cracks on
cavity and welded with filler rod ER308L, grains in cavity’s surfaces could have important contribution
base metal and in HAZ are unchanged. Grains in and help welding procedure for die reparation can be
solid-liquid boundary are also small and grow up to operated easily and more effectively. The results of
middle of weld bead. With filler rod ER316L, results the research enhance readiness of mold reparation at
when evaluate microstructure shows same conclusion. the first step: choosing suitable filler rods for each
specific popular steel grades used to machine mold or
Therefore, steel grade S50C is compatible with filler die cavities.
rod ER308L and ER316L.
REFERENCES
In addition, based on hardness disparity between
inside and outside zone of the weld bead that can [1]. Kondapalli Siva Prasad*, Chalamalasetti Srinivasa Rao and
affected on difficulty in machining processing after Damera Nageswara Rao, “A Review on Welding of AISI 304L
Austenitic Stainless Steel”, 22 June, 2012.
welding. The compatibility between additive steel
rods and steel used as die cavity can be defined as [2]. Thompson S., “Handbook of mold, tool and die repair
welding”, Abington Publishing, 1999.
following: steel rod ER304L suitable for SKD11,
additive rod ER316L should be used for SKD61 in [3]. Edward J. Vinarcik, High Integrity Die Casting Processes,
ISBN 0-471-20131-6, 2003.
weld reparation; in welding experiments of P20,
ER304L is recommended as additive material and for [4]. Muhammed K.A., M. Waly, and M. Samy El-Gayyar, The
effect of high pressure die casting parameter on the porosity
S50C, ER308L is the best choice for fix indentation and mechanical properties of Aluminum silicon ADC12 alloy,
on cavity surfaces. Current Science International, ISSN: 2007-4435, 2017.
[5]. Van-Thuc Nguyen, Vo Thi Thu Nhu, Xuan-Tien Vo. Cold-
welded joint characteristics of gold nanowires viaatomistic
simulation; Materials Today Communications 38 (2024)
108446.
[6]. Đoàn Nguyễn Văn. Giáo trình đồ gá và khuôn dập, Đại học
Công nghiệp Hà Nội, p.119-120.
[7]. Rajiv Shivpuri. Dies and Die Materials for Hot Forging, The
Ohio State University, p. 47-52.
Fig. 7. Microstructure of weld bead in which S50C
steel plate is welded and filled with ER308L
Table 4. Results of hardness tests
by measured between two zones inside and outside of
the weld bead after weld
Rockwell Hardness, scale B (HRB)
Steel
grade ER316L ER309L ER308L ER304L
Inside Outside Inside Outside Inside Outside Inside Outside
90 106 80 113 90 110 105 115
SKD1 1 92 110 81 113 89 108 106 114
90 112 85 110 91 107 105 115
SKD6 1 90 95 86 105 97 105 108 97
91 94 87 106 94 100 109 98
91 95 88 110 95 103 107 98
83 115 85 108 87 110 115 111
P20 82 113 84 110 88 112 114 113
85 113 84 109 87 115 111 113
ISBN: 978-604-80-9779-0