Microsegregation of a new Ni-Co-based superalloy prepared by electron beam smelting layered solidification technology and its homogenization behavior

被引：36

作者：

Cui, Hongyang ^{[1
,2
]}

Tan, Yi ^{[1
,2
]}

Bai, Rusheng ^{[1
,2
]}

Li, Yi ^{[1
,2
]}

Zhuang, Xinpeng ^{[1
,2
]}

Chen, Ziang ^{[1
,2
]}

You, Xiaogang ^{[1
,2
,3
]}

Li, Pengting ^{[1
,2
]}

Cui, Chuanyong ^{[4
]}

机构：

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China

[2] Key Lab Energy Beam Met & Adv Mat Preparat Liaoni, Dalian 116024, Peoples R China

[3] Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2022年 / 184卷

基金：

中国国家自然科学基金;

关键词：

Electron beam smelting; Layered solidification; Ni-Co-based superalloy; Homogenization behavior; STRENGTHENING MECHANISMS; INCONEL; 718; MICROSTRUCTURE; PRECIPITATION;

D O I：

10.1016/j.matchar.2021.111668

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electron beam smelting layered solidification technology (ER S-LST) is put forward to fabricate a new Ni-Cobased superalloy with less segregation. The microstructures and homogenization behavior of the prepared ingot were studied. The experimental results show that the cross-sectional microstructure of the EBS-LST alloy consists of four typical areas, namely melted zone (MZ), partially fusion zone (PFZ), heat affected zone (HAZ), and bottom layer (BL). During the EBS-LST solidification process, the cooling rate is calculated to be 22.3 k/s according to the well-established model associated with secondary dendrite arm spacing. It can be inferred that the EBS-LST will reduce the solidification time, and thus eliminating the macrosegregation, and weaken the microsegregation of the ingot effectively. The effect of homogenization treatment on the microsegregation and microstructure evolution of the alloy is also studied. The residual segregation index equation during homogenization is constructed for the diffusion behavior of the strongly segregated elements of Ti and W. The diffusion coefficients D-W and D-Ti are calculated as 3.9 x 10(-15) m(2).s(-1) and 5.4 x 10(-15) m(2).s(-1), respectively.

引用

页数：10

共 32 条

[1] Factors controlling segregation tendency of solute Ti, Ag and Ta into different symmetrical tilt grain boundaries of tungsten: First-principles and experimental study [J].