变形强化钨合金性能的各向异性
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摘要
采用粉末冶金法制备钨合金棒材,通过锻造变形的方法进一步提高钨合金棒材的力学性能,并采用混合率模型计算不同状态钨合金的强度。与实验结果比较发现,应力传递模型可以很好地反应随着变形量增加钨合金强度增加的变化趋势。通过对变形强化钨合金轴向和径向力学性能、断口特征、金相组织的比较以及钨合金在承载过程中的定量力学分析指出,随着钨合金变形量的增加,大面积的基体相韧窝断裂被基体撕裂棱状断裂和钨颗粒的穿晶解理断裂所取代,这也是导致合金强度提高的原因。
The tungsten alloy bar was prepared using the powder metallurgy method,and the mechanical properties of tungsten alloy were strengthened by forging. The mixing rule model was applied to calculate the strength of tungsten alloy. Compared with experimental results,it is found that the strength of tungsten alloy increases with the amount of deformation,which can be fully revealed by the stress transfer model. The fracture mechanism changes obviously with the increase of tungsten alloy deformation,which can be proved by the results of mechanical properties and metallographic structure.
The tungsten alloy bar was prepared using the powder metallurgy method,and the mechanical properties of tungsten alloy were strengthened by forging. The mixing rule model was applied to calculate the strength of tungsten alloy. Compared with experimental results,it is found that the strength of tungsten alloy increases with the amount of deformation,which can be fully revealed by the stress transfer model. The fracture mechanism changes obviously with the increase of tungsten alloy deformation,which can be proved by the results of mechanical properties and metallographic structure.
引文
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[2]KATAVIC B,ODANOVIC Z.Effects of strain aging on the structure and mechanical properties of PM 92.5W-5Ni-2.5Fe heavy alloys[J].Powder Metallurgy,2005,48:288-294.
[3]CORDERO Z C,HUSKINS E L,PARK M,et al.Powder-route synthesis and mechanical testing of ultrafine grain tungsten alloys[J].Metallurgical and Materials Transactions A,2014,45(8):3609-3618.
[4]GONG X,FAN J L,DING F,et al.Microstructure and highly enhanced mechanical properties of fine-grained tungsten heavy alloy after one-pass rapid hot extrusion[J].Materials Science and Engineering A,2011,528:3646-3652.
[5]史洪刚,齐志望,郭志俊,等.锻造变形量对钨合金材料性能的影响[J].兵器材料科学与工程,1998,21(4):3-6.
[6]SHAO Y,YU K Y,JIANG D Q,et al.High strength W/Ti Ni micro-laminated composite with transformation-mediated ductility[J].Materials&Design,2016,106:415-419.
[7]SHENG H,VAN OOST G,ZHURKIN E,et al.High temperature strain hardening behavior in double forged and potassium doped tungsten[J].Journal of Nuclear Materials,2014,444:214-219.
[8]MURESAN R,PAVEL C,SALOMIE D,et al.Thermomechanical processing of some heavy alloys from the system W-Ni-Fe through rotary forging[J].Advanced Materials Research,2007,23:111-114.
[9]范爱国,师一华.国外弹用高性能钨重合金研究进展[J].兵器材料科学与工程,1999,22(1):45-48.
[10]BATTABYAL M,SCHAUBIN R,SPATG P,et al.Microstructure and mechanical properties of a W-2wt.%Y2O3composite produced by sintering and hot forging[J].Journal of Nuclear Materials,2013,442(1/2/3):S225-S228.
[11]RAVI KIRAN U,VENKAT S,RISHIKESH B,et al.Effect of tungsten content on microstructure and mechanical properties of swaged tungsten heavy alloys[J].Material Science&Engineering A,2013,582:389-396.
[12]史洪刚,柴东郎.钨合金微观组织断裂分析计算[J].兵器材料科学与工程,1999,22(6):3-6.
[13]郭志俊,史洪刚,冯宏伟,等.大变形对钨合金材料扫描断口及力学性能的影响[J].兵器材料科学与工程,1999,22(5):45-48.