摘要
利用电子背散射衍射(EBSD)、场发射扫描电镜(SEM)和拉伸试验研究了室温冷轧对Hastelloy C-276镍基合金微观组织与力学性能的影响。结果表明,退火态C-276合金组织中含有大量的退火孪晶,孪晶界约占晶界总量的43.7%,抗拉强度为831.0 MPa,断后伸长率为45.0%。当压下率为16%和26%时,试样表面形成纳米晶而心部晶粒没有明显变化,从而造成板材组织的梯度分布,抗拉强度上升至914.0 MPa,断后伸长率下降至13.6%;当压下率增加至36%时,变形渗透到试样中心,梯度组织消失,抗拉强度上升至927.0 MPa,断后伸长率上升至39.2%;当压下率增加至45%时,晶粒沿轧制方向被拉长,孪晶的完全共格关系遭到破坏,组织中产生强烈的Brass织构{011}<211>、Goss织构{011}<001>、Cu织构{112}<111>和S织构{123}<634>,抗拉强度增加至1175.7 MPa,断后伸长率下降至10.2%。
Effect of cold rolling with different reduction rates on microstructure and mechanical properties of Hastelloy C-276 nickel-based alloy at room temperature was studied by using electron backscatter diffraction(EBSD),field emission scanning electron microscope(SEM),tensile test and other technologies.The results show that the annealed C-276 alloy contains a large number of annealing twins,and the twin boundaries account for about 43.7%of the total grain boundaries,the tensile strength is 831.0 MPa,and the elongation after fracture is 45.0%.When the reduction rates are 16%and 26%,nanocrystals are formed on the surface of the specimen,while the core grains have no obvious change,resulting in a gradient distribution of the plate structure,the tensile strength increases to 914.0 MPa,and the elongation after fracture decreases to 13.6%.When the reduction rate increases to 36%,the deformation penetrates into the core of the specimen,and the gradient structure disappears,the tensile strength increases to 927.0 MPa,and the elongation after fracture increases to 39.2%.When the reduction rate increases to 45%,the grains are elongated along the rolling direction,the complete coherent relationship of twins is destroyed,and strong Brass texture{011}<211>,Goss texture{011}<001>,Cu texture{112}<111>and S texture{123}<634>are generated in the structure.The tensile strength increases to 1175.7 MPa,and the elongation after fracture decreases to 10.2%.
作者
费海洋
邹乾坤
杨永
宋孟
李天瑞
Fei Haiyang;Zou Qiankun;Yang Yong;Song Meng;Li Tianrui(School of Metallurgical Engineering,Anhui University of Technology,Ma anshan Anhui 243002,China)
出处
《金属热处理》
北大核心
2025年第8期150-157,共8页
Heat Treatment of Metals
基金
国家自然科学基金(52301028)
安徽省教育厅高校科研项目(2022AH050333)
安徽省自然科学基金(2108085QE214)。
