冷轧工艺对C17410铍钴铜合金组织性能的影响

Effect of Cold Rolling Process on Structure and Properties of C17410 Beryllium-Cobalt-Copper Alloy

研究了C17410铍钴铜合金热轧带坯在冷轧过程中不同冷轧加工率对合金显微组织和力学性能的影响,并分析合金冷加工变形机理。结果表明,热轧带坯经过20%冷轧,合金晶内产生了大量弥散分布的位错、位错胞和位错带,加工硬化作用显著,使合金的强度、硬度明显增大而伸长率急剧下降;当加工率为40%时,位错胞数量增多,且孪晶和位错、位错胞相互作用,使硬度和抗拉强度持续增大,伸长率明显下降;当加工率增大到60%时,合金中形成了较多的纤维带;当加工率大于80%时,位错密度增大并形成较多相互交叉的切变带,使晶粒明显细化。经过冷轧加工,材料的抗拉强度和硬度分别由热轧态的347 MPa和121HV升高至冷轧加工率95%时的631 MPa和211HV,伸长率则由36.1%降低至7.4%。

The effects of different cold rolling rate on the microstructure and mechanical properties of C17410beryllium-cobalt-copper alloy hot rolled strip blank during cold rolling were studied.And the cold working deformation mechanism of the alloy was analyzed.The results show that after 20%cold rolling of hot rolled strip,a large number of dispersed dislocations,dislocation cells and dislocation bands are produced in the alloy crystal,and the processing hardening effect is significant,which makes the strength and hardness of the alloy increase obviously and the elongation decreases sharply.When the processing rate is 40%,the number of dislocation cells increases,and twin crystals interact with dislocation and dislocation cells,so that the hardness and tensile strength continue to increase,and the elongation significantly decreases.When the processing rate increases to 60%,more fiber bands are formed in the alloy.When the processing rate is more than80%,the dislocation density increases and more shear bands are formed,which makes the grain obviously refined.After cold rolling,the tensile strength and hardness of the material increase from 347 MPa and 121HV in hot rolling state to 631 MPa and211HV in cold rolled processing rate of 95%,and the elongation decreases from 36.1%to 7.4%.