Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

Gao Sifeng; Liu Lin; Xu Yiku; Yang Chubin; Zhang Jun; Fu Hengzhi

Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

Gao Sifeng, Liu Lin, Xu Yiku, Yang Chubin, Zhang Jun, Fu Hengzhi

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

11 Scopus citations

Abstract

The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 K·cm^-1 and at withdrawal rates ranging from 30 to 200 m·s^-1. The experimental results show that the primary and secondary dendritic arm spacings (PDAS and SDAS) decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi's model. The relationships of PDAS and SDAS with withdrawal rates can be described as λ₁ = 649.7V ^-0.24±0.02 and λ₂ = 281V ^-0.32±0.03, respectively. In addition, the size of the γ′ phase significantly decreases with increasing withdrawal rate.

Original language	English
Pages (from-to)	159-164
Number of pages	6
Journal	China Foundry
Volume	9
Issue number	2
State	Published - 2012

Keywords

Dendritic spacing
Directional solidification
Ni-base superalloys
γ′ phase

Cite this

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title = "Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3",

abstract = "The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 K·cm-1 and at withdrawal rates ranging from 30 to 200 m·s-1. The experimental results show that the primary and secondary dendritic arm spacings (PDAS and SDAS) decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi's model. The relationships of PDAS and SDAS with withdrawal rates can be described as λ1 = 649.7V -0.24±0.02 and λ2 = 281V -0.32±0.03, respectively. In addition, the size of the γ′ phase significantly decreases with increasing withdrawal rate.",

keywords = "Dendritic spacing, Directional solidification, Ni-base superalloys, γ′ phase",

author = "Gao Sifeng and Liu Lin and Xu Yiku and Yang Chubin and Zhang Jun and Fu Hengzhi",

year = "2012",

language = "英语",

volume = "9",

pages = "159--164",

journal = "China Foundry",

issn = "1672-6421",

publisher = "Springer Nature",

number = "2",

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TY - JOUR

T1 - Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

AU - Sifeng, Gao

AU - Lin, Liu

AU - Yiku, Xu

AU - Chubin, Yang

AU - Jun, Zhang

AU - Hengzhi, Fu

PY - 2012

Y1 - 2012

N2 - The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 K·cm-1 and at withdrawal rates ranging from 30 to 200 m·s-1. The experimental results show that the primary and secondary dendritic arm spacings (PDAS and SDAS) decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi's model. The relationships of PDAS and SDAS with withdrawal rates can be described as λ1 = 649.7V -0.24±0.02 and λ2 = 281V -0.32±0.03, respectively. In addition, the size of the γ′ phase significantly decreases with increasing withdrawal rate.

AB - The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 K·cm-1 and at withdrawal rates ranging from 30 to 200 m·s-1. The experimental results show that the primary and secondary dendritic arm spacings (PDAS and SDAS) decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi's model. The relationships of PDAS and SDAS with withdrawal rates can be described as λ1 = 649.7V -0.24±0.02 and λ2 = 281V -0.32±0.03, respectively. In addition, the size of the γ′ phase significantly decreases with increasing withdrawal rate.

KW - Dendritic spacing

KW - Directional solidification

KW - Ni-base superalloys

KW - γ′ phase

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M3 - 文章

AN - SCOPUS:84862677518

SN - 1672-6421

VL - 9

SP - 159

EP - 164

JO - China Foundry

JF - China Foundry

IS - 2

ER -

Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

Abstract

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