STUDY OF FLOW SOFTENING MECHANISMS OF A NICKEL-BASED SUPERALLOY WITH δ PHASE

被引：14

作者：

Lin, Y. C. ^{[1
,2
,3
]}

He, Dao-Guang ^{[1
,2
]}

Chen, Ming-Song ^{[1
,3
]}

Chen, Xiao-Min ^{[1
,3
]}

Zhao, Chun-Yang ^{[1
,2
]}

Ma, Xiang ^{[4
]}

机构：

[1] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Hunan, Peoples R China

[3] State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China

[4] Sintef Mat & Chem, POB 124, N-0314 Oslo, Norway

来源：

ARCHIVES OF METALLURGY AND MATERIALS | 2016年 / 61卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Alloys; Hot deformation; Flow softening behavior; Microstructural evolution; NI-BASED SUPERALLOY; HOT DEFORMATION-BEHAVIOR; DYNAMIC RECRYSTALLIZATION; ELEVATED-TEMPERATURE; CONSTITUTIVE MODEL; PROCESSING MAP; MICROSTRUCTURAL EVOLUTION; IN718; SUPERALLOY; STAINLESS-STEEL; ALLOY;

D O I：

10.1515/amm-2016-0251

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The flow softening behaviors of a nickel-based superalloy with delta phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD), optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s(-1)), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s(-1)), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of delta phase (Ni3Nb).

引用

页码：1191 / 1200

页数：10

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