摘要
采用金相、电子背向散射衍射、高温拉伸试验和扫描电镜观察等手段研究了不同温度下3Al AFA不锈钢高温短时力学性能,600~750℃下以0.2 mm·min^(-1)的拉伸速率进行高温拉伸测试。结果表明,3Al AFA钢的短时力学性能与拉伸温度密切相关。当拉伸温度从600℃升高到750℃时,试验钢的抗拉强度减小;因其发生动态再结晶,屈服强度在700℃时有略微升高,试验钢的伸长率在700℃时大幅升高。在室温拉伸过程中,试验钢出现明显的颈缩现象,随着拉伸温度的升高,拉伸过程中的颈缩现象不明显,出现韧窝与解理断裂混合断口。EBSD分析表明,随着拉伸温度的升高,由于动态再结晶的发生,小角度晶界向大角度晶界转变。大角度晶界从室温时的7.69%增至700℃时的12.04%,而典型再结晶取向{001}<110>旋转Cube织构增强。
The high-temperature short-time mechanical properties of 3Al alumina-forming-austenitic(AFA)stainless steel at different temperatures were studied by means of metallography,electron backscatter diffraction(EBSD),high-temperature tension test and scanning electron microscope(SEM)observation.The high-temperature tensile tests were carried out at 600-750℃with the tensile rate of 0.2 mm·min^(-1).The results show that the short-time mechanical properties of 3Al AFA steel are closely related to tensile temperature.When the tensile temperature increases from 600℃to 750℃,the tensile strength of the test steel decreases.Due to the dynamic recrystallization,the yield strength increases slightly at 700℃,and the elongation of the test steel greatly increases at 700℃.During the tensile process at room temperature,the test steel has obvious necking phenomenon.With the increase of tensile temperature,the necking phenomenon is not obvious during tensile process,and the mixed fracture of dimple and cleavage fracture appears.EBSD analysis shows that with the increase of tensile temperature,the grain boundary changes from small angle to large angle due to dynamic recrystallization.The large angle grain boundary increases from 7.69%at room temperature to 12.04%at 700℃,and the typical recrystallization orientation of{001}<110>rotation Cube texture increases.
作者
刘玲
陈拂晓
孙红英
郭俊卿
相楠
LIU Ling;CHEN Fu-xiao;SUN Hong-ying;GUO Jun-qing;XIANG Nan(School of Materials Science&Engineering,Henan University of Science and Technology,Luoyang 471023,China;School of Mechanical Engineering,Anyang Institute of Technology,Anyang 455000,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第4期80-88,共9页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(U1904194,51905156)
河南省高等学校重点科研项目(20A46001490)。
关键词
高温拉伸
AFA不锈钢
高温强度
high-temperature tensile test
AFA stainless steel
high-temperature strength
作者简介
通信作者:陈拂晓,男,1962年生,博士,教授,主要从事塑性成形的组织转变及数值模拟研究,E-mail:Chenfx126@126.com;第一作者:刘玲,女,1977年生,博士研究生,主要从事新型含铝奥氏体耐热钢力学性能研究,E-mail:liuling982140@126.com。
