Microstructure study of the hardening mechanism of Cr-Ni alloy deposits after flame heating for a few seconds

Ching An Huang; Che Kuan Lin; Wen An Chiou; Fu Yung Hsu

doi:10.1016/j.surfcoat.2011.07.024

Microstructure study of the hardening mechanism of Cr-Ni alloy deposits after flame heating for a few seconds

Ching An Huang^*, Che Kuan Lin, Wen An Chiou, Fu Yung Hsu

^*Corresponding author for this work

Department of Mechanical Engineering

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

6 Scopus citations

Abstract

Cr-Ni alloy deposits with different chemical compositions could be obtained from a bath with trivalent Cr and divalent Ni ions. With a plating current density above 20A dm^-2, amorphous Cr-rich alloy deposits were obtained, and crystalline Ni-rich deposits were achieved with an electroplating current density lower than 15 A dm^-2. The hardness of the Ni-rich deposit decreased gradually with increasing flame-heating time. On the contrary, the hardness of Cr-rich alloy deposit could be significantly increased from 550Hv to 1450Hv after flame heating for 3s. The results of a microstructure study show that the precipitation of nano-sized carbon-related particles, possibly diamond-like particles, could be the main hardening mechanism of flame-heated Cr-rich alloy deposit. These particles have particularly high hardness values, and they distort the nearby Cr-rich lattice, which leads to obvious strain fields in the flame-hardened Cr-rich alloy deposits.

Original language	English
Pages (from-to)	325-329
Number of pages	5
Journal	Surface and Coatings Technology
Volume	206
Issue number	2-3
DOIs	https://doi.org/10.1016/j.surfcoat.2011.07.024
State	Published - 25 10 2011

Keywords

Cr-Ni alloy deposit
Hardness
Microstructure
Trivalent chromium ions

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10.1016/j.surfcoat.2011.07.024

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@article{2b25f3605fad46b28f060fd7f397f618,

title = "Microstructure study of the hardening mechanism of Cr-Ni alloy deposits after flame heating for a few seconds",

abstract = "Cr-Ni alloy deposits with different chemical compositions could be obtained from a bath with trivalent Cr and divalent Ni ions. With a plating current density above 20A dm-2, amorphous Cr-rich alloy deposits were obtained, and crystalline Ni-rich deposits were achieved with an electroplating current density lower than 15 A dm-2. The hardness of the Ni-rich deposit decreased gradually with increasing flame-heating time. On the contrary, the hardness of Cr-rich alloy deposit could be significantly increased from 550Hv to 1450Hv after flame heating for 3s. The results of a microstructure study show that the precipitation of nano-sized carbon-related particles, possibly diamond-like particles, could be the main hardening mechanism of flame-heated Cr-rich alloy deposit. These particles have particularly high hardness values, and they distort the nearby Cr-rich lattice, which leads to obvious strain fields in the flame-hardened Cr-rich alloy deposits.",

keywords = "Cr-Ni alloy deposit, Hardness, Microstructure, Trivalent chromium ions",

author = "Huang, {Ching An} and Lin, {Che Kuan} and Chiou, {Wen An} and Hsu, {Fu Yung}",

year = "2011",

month = oct,

day = "25",

doi = "10.1016/j.surfcoat.2011.07.024",

language = "英语",

volume = "206",

pages = "325--329",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier B.V.",

number = "2-3",

}

TY - JOUR

T1 - Microstructure study of the hardening mechanism of Cr-Ni alloy deposits after flame heating for a few seconds

AU - Huang, Ching An

AU - Lin, Che Kuan

AU - Chiou, Wen An

AU - Hsu, Fu Yung

PY - 2011/10/25

Y1 - 2011/10/25

N2 - Cr-Ni alloy deposits with different chemical compositions could be obtained from a bath with trivalent Cr and divalent Ni ions. With a plating current density above 20A dm-2, amorphous Cr-rich alloy deposits were obtained, and crystalline Ni-rich deposits were achieved with an electroplating current density lower than 15 A dm-2. The hardness of the Ni-rich deposit decreased gradually with increasing flame-heating time. On the contrary, the hardness of Cr-rich alloy deposit could be significantly increased from 550Hv to 1450Hv after flame heating for 3s. The results of a microstructure study show that the precipitation of nano-sized carbon-related particles, possibly diamond-like particles, could be the main hardening mechanism of flame-heated Cr-rich alloy deposit. These particles have particularly high hardness values, and they distort the nearby Cr-rich lattice, which leads to obvious strain fields in the flame-hardened Cr-rich alloy deposits.

AB - Cr-Ni alloy deposits with different chemical compositions could be obtained from a bath with trivalent Cr and divalent Ni ions. With a plating current density above 20A dm-2, amorphous Cr-rich alloy deposits were obtained, and crystalline Ni-rich deposits were achieved with an electroplating current density lower than 15 A dm-2. The hardness of the Ni-rich deposit decreased gradually with increasing flame-heating time. On the contrary, the hardness of Cr-rich alloy deposit could be significantly increased from 550Hv to 1450Hv after flame heating for 3s. The results of a microstructure study show that the precipitation of nano-sized carbon-related particles, possibly diamond-like particles, could be the main hardening mechanism of flame-heated Cr-rich alloy deposit. These particles have particularly high hardness values, and they distort the nearby Cr-rich lattice, which leads to obvious strain fields in the flame-hardened Cr-rich alloy deposits.

KW - Cr-Ni alloy deposit

KW - Hardness

KW - Microstructure

KW - Trivalent chromium ions

UR - http://www.scopus.com/inward/record.url?scp=80052367632&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2011.07.024

DO - 10.1016/j.surfcoat.2011.07.024

M3 - 文章

AN - SCOPUS:80052367632

SN - 0257-8972

VL - 206

SP - 325

EP - 329

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 2-3

ER -

Microstructure study of the hardening mechanism of Cr-Ni alloy deposits after flame heating for a few seconds

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Keywords

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