Mechanism of Martensitic to Equiaxed Microstructure Evolution during Hot Deformation of a Near-Alpha Ti Alloy

被引：17

作者：

Shams, Seyed Amir Arsalan ^{[1
]}

Mirdamadi, Shamsoddin ^{[1
]}

Abbasi, Seyed Mahdi ^{[2
]}

Kim, Daehwan ^{[3
]}

Lee, Chong Soo ^{[3
]}

机构：

[1] IUST, Sch Met & Mat Engn, Tehran 1684613114, Iran

[2] Maleke Ashtar Univ Technol, MMRC, Tehran 1678815611, Iran

[3] Pohang Univ Sci & Technol POSTECH, GIFT, Pohang 790784, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2017年 / 48A卷 / 06期

关键词：

TI-6AL-4V ALLOY; LAMELLAR MICROSTRUCTURE; FLOW BEHAVIOR; DYNAMIC GLOBULARIZATION; STATIC GLOBULARIZATION; COARSENING BEHAVIOR; VARIANT SELECTION; TITANIUM-ALLOY; PLASTIC-FLOW; KINETICS;

D O I：

10.1007/s11661-017-4065-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, mechanisms of microstructural evolution during hot deformation of Ti-1100 were investigated by EBSD analysis. Misorientation angle distribution of initial microstructure showed that diffusionless martensitic phase transformation in Ti-1100 obeys Burgers orientation relationship, and most of the high-angle-grain boundaries consist of angles of 60 and 63 deg. Calculated activation energy of hot deformation (similar to 338 kJ/mol) and EBSD grain boundary maps revealed that continuous dynamic recrystallization (CDRX) is the dominant mechanism during hot compression at 1073 K (800 A degrees C) and strain rate of 0.005 s(-1). At a temperature range of 1073 K to 1173 K (800 A degrees C to 900 A degrees C), not only the array of variants lying perpendicular to compression axis but also CDRX contributes to flow softening. Increasing the rolling temperature from 1123 K to 1273 K (850 A degrees C to 1000 A degrees C) brought about changes in spheroidization mechanism from CDRX to conventional boundary splitting and termination migration correlated with the higher volume fraction of beta phase at higher temperatures. (C) The Minerals, Metals & Materials Society and ASM International 2017

引用

页码：2979 / 2992

页数：14

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