Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys

Shinichiro Hayata, Satoshi Oue, Takehiro Takahashi, Hiroaki Nakano

研究成果: ジャーナルへの寄稿記事

抄録

Ni-W alloys were electrodeposited onto steel sheets with an initial Ni plating. The electrodeposition was conducted in unagitated sulfate solution containing citric acid at pH 5 and 60°C under coulostatic (9.0 × 105 C·m-2) and galvanostatic (100-3 000 A·m-2) conditions. The effect of annealing duration on the structure and hardness of the deposited Ni-W alloys was investigated. Compared with the non-annealed case, annealing for several seconds significantly increased the crystallite size of the Ni in the deposits. Moreover, the crystallite size gradually increased with annealing duration. When the holding time at 700°C was increased to 100 s and 1 000 s, the Ni4 W and NiW precipitates increased and coarsened in the upper layers of the deposits. Annealing increased the hardness of all deposits, especially at high current densities (i.e., at high W content in the deposits). In deposits with 45 mass% W content, the hardness was maximized at a holding time of 10 s at 700°C, and gradually decreased as the holding time increased. Under the optimal precipitation conditions, the Ni4W and NiW precipitates were fine and uniformly distributed throughout the deposits.

元の言語英語
ページ(範囲)1248-1255
ページ数8
ジャーナルisij international
56
発行部数7
DOI
出版物ステータス出版済み - 1 1 2016

Fingerprint

Deposits
Hardness
Annealing
Crystallite size
Precipitates
Citric acid
Steel sheet
Plating
Electrodeposition
Citric Acid
Sulfates
Current density

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys. / Hayata, Shinichiro; Oue, Satoshi; Takahashi, Takehiro; Nakano, Hiroaki.

:: isij international, 巻 56, 番号 7, 01.01.2016, p. 1248-1255.

研究成果: ジャーナルへの寄稿記事

@article{d2914e469f4443a9a109e40ad5868966,
title = "Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys",
abstract = "Ni-W alloys were electrodeposited onto steel sheets with an initial Ni plating. The electrodeposition was conducted in unagitated sulfate solution containing citric acid at pH 5 and 60°C under coulostatic (9.0 × 105 C·m-2) and galvanostatic (100-3 000 A·m-2) conditions. The effect of annealing duration on the structure and hardness of the deposited Ni-W alloys was investigated. Compared with the non-annealed case, annealing for several seconds significantly increased the crystallite size of the Ni in the deposits. Moreover, the crystallite size gradually increased with annealing duration. When the holding time at 700°C was increased to 100 s and 1 000 s, the Ni4 W and NiW precipitates increased and coarsened in the upper layers of the deposits. Annealing increased the hardness of all deposits, especially at high current densities (i.e., at high W content in the deposits). In deposits with 45 mass{\%} W content, the hardness was maximized at a holding time of 10 s at 700°C, and gradually decreased as the holding time increased. Under the optimal precipitation conditions, the Ni4W and NiW precipitates were fine and uniformly distributed throughout the deposits.",
author = "Shinichiro Hayata and Satoshi Oue and Takehiro Takahashi and Hiroaki Nakano",
year = "2016",
month = "1",
day = "1",
doi = "10.2355/isijinternational.ISIJINT-2016-111",
language = "English",
volume = "56",
pages = "1248--1255",
journal = "ISIJ International",
issn = "0915-1559",
publisher = "Iron and Steel Institute of Japan",
number = "7",

}

TY - JOUR

T1 - Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys

AU - Hayata, Shinichiro

AU - Oue, Satoshi

AU - Takahashi, Takehiro

AU - Nakano, Hiroaki

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Ni-W alloys were electrodeposited onto steel sheets with an initial Ni plating. The electrodeposition was conducted in unagitated sulfate solution containing citric acid at pH 5 and 60°C under coulostatic (9.0 × 105 C·m-2) and galvanostatic (100-3 000 A·m-2) conditions. The effect of annealing duration on the structure and hardness of the deposited Ni-W alloys was investigated. Compared with the non-annealed case, annealing for several seconds significantly increased the crystallite size of the Ni in the deposits. Moreover, the crystallite size gradually increased with annealing duration. When the holding time at 700°C was increased to 100 s and 1 000 s, the Ni4 W and NiW precipitates increased and coarsened in the upper layers of the deposits. Annealing increased the hardness of all deposits, especially at high current densities (i.e., at high W content in the deposits). In deposits with 45 mass% W content, the hardness was maximized at a holding time of 10 s at 700°C, and gradually decreased as the holding time increased. Under the optimal precipitation conditions, the Ni4W and NiW precipitates were fine and uniformly distributed throughout the deposits.

AB - Ni-W alloys were electrodeposited onto steel sheets with an initial Ni plating. The electrodeposition was conducted in unagitated sulfate solution containing citric acid at pH 5 and 60°C under coulostatic (9.0 × 105 C·m-2) and galvanostatic (100-3 000 A·m-2) conditions. The effect of annealing duration on the structure and hardness of the deposited Ni-W alloys was investigated. Compared with the non-annealed case, annealing for several seconds significantly increased the crystallite size of the Ni in the deposits. Moreover, the crystallite size gradually increased with annealing duration. When the holding time at 700°C was increased to 100 s and 1 000 s, the Ni4 W and NiW precipitates increased and coarsened in the upper layers of the deposits. Annealing increased the hardness of all deposits, especially at high current densities (i.e., at high W content in the deposits). In deposits with 45 mass% W content, the hardness was maximized at a holding time of 10 s at 700°C, and gradually decreased as the holding time increased. Under the optimal precipitation conditions, the Ni4W and NiW precipitates were fine and uniformly distributed throughout the deposits.

UR - http://www.scopus.com/inward/record.url?scp=84982308350&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84982308350&partnerID=8YFLogxK

U2 - 10.2355/isijinternational.ISIJINT-2016-111

DO - 10.2355/isijinternational.ISIJINT-2016-111

M3 - Article

VL - 56

SP - 1248

EP - 1255

JO - ISIJ International

JF - ISIJ International

SN - 0915-1559

IS - 7

ER -