Tensile deformation behaviour of forged disc of IN 718 superalloy at 650 °C

被引：54
|
作者：
Prasad, Kartik [1 ]
Sarkar, Rajdeep [1 ]
Ghosal, P. [1 ]
Kumar, Vikas [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
MATERIALS & DESIGN | 2010年 / 31卷 / 09期
关键词：
SERRATED FLOW; NICKEL; CREEP;
D O I：
10.1016/j.matdes.2010.04.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The tensile properties of forged disc of IN 718 superalloy were evaluated in the strain rate regime between 10(-4) and 10(-2) s(-1) at 650 degrees C. Flow oscillations were observed in stress-strain curves in the strain rate regime investigated. These flow oscillations were identified as strain increments attributed to twining mechanism at all the strain rates. However, presence of well defined serrations, temperature insensitivity of yield strength and increase in strain hardening exponent confirmed the occurrence of dynamic strain aging at 10(-3)-10(-2) s(-1) strain rates. Deformation behaviour was observed to be planer in nature. Fracture features remained same (transgranular) in the strain rate regime studied. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4502 / 4507
页数：6
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