摘要
针对Haynes230镍基合金进行了不同温度下的拉伸实验,采用电子背散射衍射(Electron backscattered diffraction,EBSD)技术研究了该材料高温下的拉伸变形行为的微观机理。结果表明:Haynes材料在800℃以内有较高的抵抗塑性变形的能力;650℃温度下,材料表现出了明显的动态应变时效(dynamic strain aging, DSA)现象,700和800℃下的DSA效应相差不多,760℃下的DSA效应最弱。DSA效应的强化作用,使得650℃下合金仍保持较高的强度,且800℃抗拉强度与760℃的相比下降不多。EBSD结果表明,室温下断口附近组织出现了大量的变形孪晶,晶粒取向以<111>为主;650℃下断口附近组织的<111>取向特征更为明显,且晶界发生了弯曲变形,对位错运动的阻力增加;随着温度增加,断口附近在晶间和晶内均出现了动态再结晶晶粒。
Tensile experiments were conducted at different temperatures for the Haynes230 nickel-based alloy, and the microscopic mechanism of the tensile deformation behavior at high temperatures was investigated using electron backscattered diffraction(EBSD) technique. It is shown that Haynes materials have a high resistance to plastic deformation until 800 ℃. At 650 ℃, the materials show a significant dynamic strain aging(DSA) phenomenon, and the DSA effect is similar at 700 and 800 ℃, and the DSA effect is weakest at 760 ℃. The strengthening effect of DSA effect makes the alloy still maintain high strength at 650 ℃, and the tensile strength at 800 ℃ does not decrease much compared with that at 760 ℃. The EBSD results show that a large number of deformed twins appear near the fracture at room temperature, and the grain orientation is dominated by <111>;the <111> orientation of the tissue near the fracture is more obvious at 650 ℃, and the grain boundaries are bent and deformed, which increases the resistance to dislocation movement;with the increase of temperature, dynamic recrystallization grains appear in the intergranular and intracrystalline areas near the fracture.
作者
金丹
龙浩跃
韩高枫
金铠
Jin Dan;Long Haoyue;Han Gaofeng;Jin Kai(Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第8期3013-3017,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(11102119)
辽宁省自然科学基金(201602586)。
