Effects of aging treatment on the precipitation behavior of ε-Cu phase and mechanical properties of metal injection molding 17-4PH stainless steel

Chen Yuan Chung; Yu Chih Tzeng

doi:10.1016/j.matlet.2018.11.107

Effects of aging treatment on the precipitation behavior of ε-Cu phase and mechanical properties of metal injection molding 17-4PH stainless steel

Chen Yuan Chung, Yu Chih Tzeng

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

This study mainly investigates the influence of artificial aging at 480 °C, 520 °C and 620 °C on the microstructure and mechanical properties of metal injection molding (MIM) 17-4PH. The results show the microstructure of the as-sintered MIM 17-4PH to be mainly composed of lath martensite, δ-ferrite, and nodular SiO₂ inclusions. The effect of precipitation hardening is to strengthen the MIM 17-4PH by the precipitation of a large number of fine spherical ε-Cu phases on the lath martensite matrix, which effectively block the movement of dislocations. The highest hardness is obtained by artificial aging at 480 °C for 4 h. As the aging temperature increases, the ε-Cu phase grows coarser, which results in over aging of the MIM 17-4PH and decreases the hardness.

Original language	English
Pages (from-to)	228-231
Number of pages	4
Journal	Materials Letters
Volume	237
DOIs	https://doi.org/10.1016/j.matlet.2018.11.107
State	Published - 15 Feb 2019

Keywords

Metal injection molding
Metals and alloys
Microstructure
Nanosize
Particles

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10.1016/j.matlet.2018.11.107

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title = "Effects of aging treatment on the precipitation behavior of ε-Cu phase and mechanical properties of metal injection molding 17-4PH stainless steel",

abstract = "This study mainly investigates the influence of artificial aging at 480 °C, 520 °C and 620 °C on the microstructure and mechanical properties of metal injection molding (MIM) 17-4PH. The results show the microstructure of the as-sintered MIM 17-4PH to be mainly composed of lath martensite, δ-ferrite, and nodular SiO2 inclusions. The effect of precipitation hardening is to strengthen the MIM 17-4PH by the precipitation of a large number of fine spherical ε-Cu phases on the lath martensite matrix, which effectively block the movement of dislocations. The highest hardness is obtained by artificial aging at 480 °C for 4 h. As the aging temperature increases, the ε-Cu phase grows coarser, which results in over aging of the MIM 17-4PH and decreases the hardness.",

keywords = "Metal injection molding, Metals and alloys, Microstructure, Nanosize, Particles",

author = "Chung, {Chen Yuan} and Tzeng, {Yu Chih}",

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T1 - Effects of aging treatment on the precipitation behavior of ε-Cu phase and mechanical properties of metal injection molding 17-4PH stainless steel

AU - Chung, Chen Yuan

AU - Tzeng, Yu Chih

PY - 2019/2/15

Y1 - 2019/2/15

N2 - This study mainly investigates the influence of artificial aging at 480 °C, 520 °C and 620 °C on the microstructure and mechanical properties of metal injection molding (MIM) 17-4PH. The results show the microstructure of the as-sintered MIM 17-4PH to be mainly composed of lath martensite, δ-ferrite, and nodular SiO2 inclusions. The effect of precipitation hardening is to strengthen the MIM 17-4PH by the precipitation of a large number of fine spherical ε-Cu phases on the lath martensite matrix, which effectively block the movement of dislocations. The highest hardness is obtained by artificial aging at 480 °C for 4 h. As the aging temperature increases, the ε-Cu phase grows coarser, which results in over aging of the MIM 17-4PH and decreases the hardness.

AB - This study mainly investigates the influence of artificial aging at 480 °C, 520 °C and 620 °C on the microstructure and mechanical properties of metal injection molding (MIM) 17-4PH. The results show the microstructure of the as-sintered MIM 17-4PH to be mainly composed of lath martensite, δ-ferrite, and nodular SiO2 inclusions. The effect of precipitation hardening is to strengthen the MIM 17-4PH by the precipitation of a large number of fine spherical ε-Cu phases on the lath martensite matrix, which effectively block the movement of dislocations. The highest hardness is obtained by artificial aging at 480 °C for 4 h. As the aging temperature increases, the ε-Cu phase grows coarser, which results in over aging of the MIM 17-4PH and decreases the hardness.

KW - Metal injection molding

KW - Metals and alloys

KW - Microstructure

KW - Nanosize

KW - Particles

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VL - 237

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EP - 231

JO - Materials Letters

JF - Materials Letters

ER -

Effects of aging treatment on the precipitation behavior of ε-Cu phase and mechanical properties of metal injection molding 17-4PH stainless steel

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Keywords

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