TY - GEN
T1 - High-temperature Properties of Hot-Work Tool Steel (AISI H13) Deposited via Direct Energy Deposition
AU - Son, Jongyoun
AU - Shin, Gwangyong
AU - Lee, Kiyong
AU - Choi, Chang hwan
AU - Shim, Dosik
N1 - Publisher Copyright:
© 2021, The Minerals, Metals & Materials Society.
PY - 2021
Y1 - 2021
N2 - Conventionally, a defected tool steel is repaired by welding; however, that repairing does not guarantee homogeneous quality. Hence, this study focused on developing an alternative repairing technique using direct energy deposition (DED) to minimize thermal effects. To investigate a repair using powder-fed DED, AISI H13 powder was deposited onto heat-treated JIS SKD61. The deposited material was observed through scanning electron microscopy and its hardness and tensile properties were determined at 25, 200, 400, 600, and 800 °C. The deposited material showed different hardness distributions in its cross-section, revealing four representative features. The deposited region and dilution showed a hardness of 620 HV with a dendrite structure. The hardness decreased to 490 HV in the heat-affected zone, revealing a tempered martensite structure; however, it increased to 550 HV in the substrate and revealed a typical martensite structure. At all temperatures, the deposited material showed higher hardness than heat-treated SKD61. Moreover, it showed higher ultimate tensile strength and lower elongation in the deposited region. Therefore, this result indicates that without pre- or post-heat treatment, a part repaired using powder-fed DED can have better mechanical properties than heat-treated SKD61.
AB - Conventionally, a defected tool steel is repaired by welding; however, that repairing does not guarantee homogeneous quality. Hence, this study focused on developing an alternative repairing technique using direct energy deposition (DED) to minimize thermal effects. To investigate a repair using powder-fed DED, AISI H13 powder was deposited onto heat-treated JIS SKD61. The deposited material was observed through scanning electron microscopy and its hardness and tensile properties were determined at 25, 200, 400, 600, and 800 °C. The deposited material showed different hardness distributions in its cross-section, revealing four representative features. The deposited region and dilution showed a hardness of 620 HV with a dendrite structure. The hardness decreased to 490 HV in the heat-affected zone, revealing a tempered martensite structure; however, it increased to 550 HV in the substrate and revealed a typical martensite structure. At all temperatures, the deposited material showed higher hardness than heat-treated SKD61. Moreover, it showed higher ultimate tensile strength and lower elongation in the deposited region. Therefore, this result indicates that without pre- or post-heat treatment, a part repaired using powder-fed DED can have better mechanical properties than heat-treated SKD61.
KW - AISI H13
KW - Direct energy deposition
KW - Elevated temperature
KW - Repair
KW - Tensile properties
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U2 - 10.1007/978-3-030-75381-8_140
DO - 10.1007/978-3-030-75381-8_140
M3 - Conference contribution
AN - SCOPUS:85112499358
SN - 9783030753801
T3 - Minerals, Metals and Materials Series
SP - 1665
EP - 1676
BT - Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity
A2 - Daehn, Glenn
A2 - Cao, Jian
A2 - Kinsey, Brad
A2 - Tekkaya, Erman
A2 - Vivek, Anupam
A2 - Yoshida, Yoshinori
T2 - 13th International Conference on the Technology of Plasticity, ICTP 2021
Y2 - 25 July 2021 through 30 July 2021
ER -