锻造工艺对粉末冶金钼棒组织和性能的影响
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摘要
采用冷等静压、烧结方式得到85mm的钼棒坯,之后采用不同锻造工艺将钼棒锻造至32mm,并对其组织和力学性能进行了测试对比。结果表明,锻造过程中回火温度、时间及回火次数以及锻造道次变形量等对锻造后钼棒组织和性能均有影响。采用的处理工艺如下:锻造前在1 200℃下保温120min,之后进行6模次锻造,每模次直径变形量为锻造前的10%～20%,整个锻造过程中每两模次进行中间回火,回火工艺为1 100℃×15min,最终得到抗拉强度达到667MPa,伸长率为26%,且组织均匀细小的钼棒。
The molybdenum bar billet with diameter of 85 mm was prepared by cold isostatic pressure and sintering.Then the molybdenum bar with diameter of 32 mm was forged by different forging ways,and its microstructure and mechanical properties were tested comparatively.The results show that some parameters,such as the tempering temperature,tempering time,times of tempering and deformation rate in the forging process have effects on the microstructure and properties of the molybdenum bar after forging.The forging processing parameters were presented as follows:before forging,the blank of molybdenum bar kept at 1 200℃for 120 min.After that,the molybdenum bar was forged for six times.After each forging,the diameter deformation of molybdenum bar billet reached 10%to 20% of that before forging.During the whole forging process,intermediate tempering was carried out every two times.The temperature and time of intermediate tempering were 1 100℃for 15 min,respectively.Finally,the tensile strength and elongation of the molybdenum bar with fine and uniform structure reach 667 MPa and 26%,respectively.
The molybdenum bar billet with diameter of 85 mm was prepared by cold isostatic pressure and sintering.Then the molybdenum bar with diameter of 32 mm was forged by different forging ways,and its microstructure and mechanical properties were tested comparatively.The results show that some parameters,such as the tempering temperature,tempering time,times of tempering and deformation rate in the forging process have effects on the microstructure and properties of the molybdenum bar after forging.The forging processing parameters were presented as follows:before forging,the blank of molybdenum bar kept at 1 200℃for 120 min.After that,the molybdenum bar was forged for six times.After each forging,the diameter deformation of molybdenum bar billet reached 10%to 20% of that before forging.During the whole forging process,intermediate tempering was carried out every two times.The temperature and time of intermediate tempering were 1 100℃for 15 min,respectively.Finally,the tensile strength and elongation of the molybdenum bar with fine and uniform structure reach 667 MPa and 26%,respectively.
引文
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[3]杨晓伟,李高林,王飞,等.高性能钼棒制备工艺研究[J].中国钨业,2014,29(6):50-52.
[4]刘宝忠,康兰玲,孙启涛.锻制钼棒工艺的研究[J].稀有金属材料与工程,1998,27(S1):165-167.
[5]黄永章,李兴彦,王力军,等.高抗拉强度纯钼棒的制备和组织研究[J].稀有金属学报,2010,34(5):684-687.
[6]张建德,曾舟山,谢飞,等.热变形致密细晶粒钼棒的组织和性能[J].粉末冶金材料科学与工程,2008,13(4):235-239.
[7]淡新国,黄先明,郭让民,等.大规格TZM钼合金锻造棒材性能研究[J].中国钼业,2013,37(5):45-48.
[8]张德尧.粉冶纯钼棒的精密锻造探索[J].稀有金属,1990(1):10-12.
[9] HIROAKI K.Development of molybdenum alloy with high toughness at low temperatures[J].Materials Transactions JIM,1996,37(1):89-97.
[10] HOSHIKA T.Effect of carbon addition on the strength and ductility of doped molybdenum[J].Journal of the Japan Society of Powder and Powder Metallurgy,1999,46(5):472-477.