不同冷轧压下率对因瓦合金组织与性能的影响  

Effect of different cold rolling reduction on microstructure and properties of invar alloy

作　　者：何承渝 蔡晨 谷宇[2] 李静媛[1] He Chengyu;Cai Chen;Gu Yu;Li Jingyuan(Beijing Advanced Innovation Center for Materials Genome Engineering,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan Shanxi 030003,China)

机构地区：[1]北京科技大学材料科学与工程学院北京材料基因工程高精尖创新中心,北京100083 [2]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003

出　　处：《金属热处理》2024年第2期120-127,共8页Heat Treatment of Metals

基　　金：山西省科技计划揭榜招标项目(20201101011)。

摘　　要：通过背散射电子衍射(EBSD)、XRD、拉伸试验、硬度测试、热膨胀测试、磁性能测试等研究了20%~90%不同冷轧压下率对因瓦合金显微组织、力学性能、热膨胀性能、饱和磁化强度和织构演变的影响。结果表明,随着冷轧压下率的增加,固溶态等轴晶粒通过位错滑移发生变形,合金被逐渐压扁拉长形成了特定的取向,导致合金的强度和硬度提高,而塑性快速下降,90%压下率时合金抗拉强度为777 MPa,而伸长率则只有5%。当冷轧压下率未超过80%时,合金的在20~100℃的平均线膨胀系数和饱和磁化强度呈现先减小后增大趋势,在60%压下率时取得最小值。合金中{110}<112>黄铜织构,{112}<111}铜型织构,{136}<634>S型织构强度随变形程度的提高而增大,当冷轧压下率达到80%时合金中形成了强烈的织构。Effect of different cold rolling reduction of 20%to 90%on the microstructure,mechanical properties,thermal expansion properties,saturation magnetization,and texture evolution of invar alloy were studied by means of backscattered electron diffraction(EBSD),XRD,tensile testing,hardness testing,thermal expansion testing,and magnetic property testing.The results show that as the cold rolling reduction increases,the equiaxed grains after solution treatment deform through dislocation sliding,and the alloy is gradually flattened and elongated to form a specific orientation,resulting in an increase in both the strength and hardness of the alloy,while the plasticity decreases rapidly.At 90%reduction,the tensile strength of the alloy is 777 MPa,while the elongation is only 5%.When the cold rolling reduction does not exceed 80%,the average linear expansion coefficient in the temperature range of 20℃to 100℃and saturation magnetization of the alloy show a trend of first decreasing and then increasing,and the alloy achieves a minimum value at 60%reduction.In the alloy,the strength of{110}<112>Brass texture,{112}<111}Copper texture,and{136}<634>S texture raises with the increasing of deformation degree.When the cold rolling reduction reaches 80%,strong textures are formed in the alloy.

关 键 词：因瓦合金 冷轧压下率 微观组织 热膨胀系数 磁性能 织构 

分 类 号：TG132.1[一般工业技术—材料科学与工程]