退火温度对轧制Mo-Re合金管材显微组织及力学性能的影响  

Effect of annealing temperature on microstructure and mechanical properties of rolled Mo⁃Re alloy tubes

作　　者：陈成[1] 朱琦[1] 席莎[1] 曾学良 张学苏 Chen Cheng;Zhu Qi;Xi Sha;Zeng Xueliang;Zhang Xuesu(Technical Center,Jinduicheng Molybdenum Co.,Ltd.,Xi’an Shaanxi 710077,China;School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an Shaanxi 710049,China)

机构地区：[1]金堆城钼业股份有限公司技术中心,陕西西安710077 [2]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《金属热处理》2024年第6期123-129,共7页Heat Treatment of Metals

摘　　要：针对薄壁钼管加工中由于大塑性变形而固有的严重各向异性问题,采用不同退火温度(900、1050、1200℃)来调控Mo-Re合金薄壁管的微观组织和力学性能。结果表明,Mo-Re合金棒料中存在大量<101>//TD的织构,呈现出明显的各向异性。锻造后经过1050℃×1 h退火的Mo-Re合金坯料,可以有效实现薄壁钼管在各向异性和强韧性方面的同步改善,其室温拉伸强度达到838 MPa,1300℃高温拉伸强度达到198 MPa,且平均硬度为230.5 HV0.3。经过1050℃×1 h退火制备的Mo-Re合金薄壁管具有优良的强韧性,这主要与退火处理后Mo-Re合金棒料的晶粒尺寸分布有关。1050℃退火后Mo-Re合金棒料的平均晶粒尺寸为23.1μm,较1200℃退火后Mo-Re合金棒料的更小,具有更高的强塑性;其晶粒尺寸集中度较900℃退火后Mo-Re合金棒料的更高,塑性变形过程中的变形协调性更好。In order to address the inherent severe anisotropy issue caused by large plastic deformation in the processing of thin⁃walled molybdenum⁃rhenium(Mo⁃Re)alloy tubes,different annealing temperatures(900,1050,1200℃)were investigated to control the microstructure and mechanical properties of the Mo⁃Re alloy thin⁃walled tubes.The results show that there is a significant<101>//TD texture in the Mo⁃Re alloy bars,indicating obvious anisotropy.The Mo⁃Re alloy billet,which is subjected to annealing at 1050℃for 1 h after forging,effectively achieves simultaneous improvement in anisotropy and strength and toughness of the thin⁃walled molybdenum tube.The room temperature tensile strength reaches 838 MPa,the high⁃temperature tensile strength at 1300℃reaches 198 MPa,and the average hardness is 230.5 HV0.3.The Mo⁃Re alloy prepared through annealing at 1050℃for 1 h exhibits excellent strength and toughness,which is mainly attributed to the distribution of grain size after annealing treatment.The average grain size of the Mo⁃Re alloy bars annealed at 1050℃was 23.1μm,which is smaller than that of the Mo⁃Re alloy bars annealed at 1200℃,resulting in higher strength and plasticity.Additionally,the concentration of grain size is higher compared to the Mo⁃Re alloy bars annealed at 900℃,indicating better deformation coordination during plastic deformation.

关 键 词：Mo-Re合金 退火温度 显微组织 力学性能 

分 类 号：TG156.25[金属学及工艺—热处理]