Laser Powder Bed Fusion of GH4099 Superalloy:Parameter Optimization and Effect of Heat Treatment on Microstructure and Mechanical Properties

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外文摘要：Ni-Cr-Co-W superalloy(GH4099)can be used to manufacture high-temperature structural components of aero-engine combustion chambers for long-term service below 900 ℃.This study provides a comprehensive evaluation of the GH4099 superalloy fabricated using the laser powder bed fusion(LPBF)technique,focusing on the opti-mization of processing parameters and a systematic investigation of the microstructural evolution and mechanical properties of the as-deposited and heat-treated samples.An optimal parameter combination was established using the response surface method(RSM)design and the variance method.The as-deposited GH4099 alloy is primarily composed of columnar crystals grown epitaxially and M23C6 carbides without the generation of the γ'-phase.After solution treatment,recrystallization and grain growth occurred,with the alloy remaining as large,irregu-larly shaped polygonal columnar crystals.The aging process precipitated substantial γ'-phase,which internally existed as a mixture of equiaxed and columnar crystals.LPBF-GH4099 superalloy exhibited a maximum room-temperature tensile strength of 1137.80 MPa and a high-temperature tensile strength of 780 MPa at 800 ℃.Various strengthening mechanisms were observed in the as-deposited and heat-treated samples.The most sig-nificant grain boundary strengthening effect was observed in the deposit state,while solution strengthening was primarily due to the segregation of elements,such as Mo,W,and Cr,in the γ matrix.Precipitation strengthening,predominantly due to the γ'-phase,emerged as the main strengthening mechanism for the GH4099 superalloy post-aging treatment.This study presents significant insights into the LPBF-GH4099 alloy and provides a solid foundation for future studies and practical applications in this field.

外文关键词：

Laser powder bed fusionGH4099 superalloyMicrostructureMechanical property

作者：

Yunfei Nie、Qian Tang、Zhonghua Li、Jun Song、Haibin Wu、Binsheng Wang、Changliang Qin、Yingzhi Ren、Ming Zhang、Kun Li

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作者单位：

State Key Laboratory of Mechanical Transmission for Advanced Equipment,Chongqing University,Chongqing,400044,China

College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing,400044,China

Chongqing Key Laboratory of Metal Additive Manufacturing(3D printing),Chongqing,400044,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Chongqing ChinaInnovation Support Program for Overseas Returnees in Chongqing ChinaState Key Laboratory of Mechanical Transmission for Advanced Equipment of China

项目编号：

519750735233500652201105CSTB2022NSCQ-MSX0992cx2023061SKLMT-MSKFKT-202104

出版年：

2024

DOI：

10.1016/j.amf.2024.200133

中国机械工程学报:增材制造前沿(英文)

ISSN：

年,卷(期)：2024.3(2)