预冷轧对1Cr18Ni9Ti奥氏体不锈钢力学性能的影响

Influence of Cold-rolling on Properties of 1Cr18Ni9Ti Austenitic Stainless Steel

研究了1Cr18Ni9Ti奥氏体不锈钢经不同变形量预冷轧后的各种力学性能。结果表明:该钢具有很强的加工硬化能力,冷变形使钢的各种强度性能、弹性变形能力和疲劳性能大大提高。当冷变形量达60%后,弹性极限及最大弹性应变分别是未变形时的4.6和4倍,弹性变形能力增加了17倍;屈服强度和抗拉强度分别是未变形时的4.5和2倍;而疲劳断裂应力则分别由1×104次循环的560/56MPa提高到960/96MPa(提高1.7倍)和由1×105次循环的530/53MPa提高到860/86MPa(提高1.5倍)。60%冷轧制后伸长率为5.05%,仍保持一定的塑性。

The properties of 1Cr18Ni9Ti austenitic stainless steel after cold rolled were studied. The results show that the steel has a intense tendency of cold-working strengthen and cold-rolling can raise the various strength and improve the elasticity and increase the fatigue property of the steel largely. After 60% cold deformation, compared with those of non deformation steel, the elastic limit stress and the corresponding strain of the steel are raised 4.6 and 4 times, the elastic ability raised 17 times;the yield strength,σ_s and σ_b increase 4.5 and 2 times respectively;the fatigue stress of 1×10~4 cycles raised from 560/56 MPa to 960/96MPa(1.7 times), and the stress of 1×10~5 cycles from 530/53 MPa to 860/86 MPa(1.5 times),the elongation is decreased to 5.05%, but the steel still has some plasticity.