冷变形对含氮028合金微观组织和力学性能的影响

通过对含氮028合金进行不同变形量的冷轧,采用光学显微镜(OM)、透射电镜(TEM)和拉伸试验研究了冷变形量对其组织和力学性能的影响。结果表明,当冷变形量相同时,随着氮含量的增加,屈服强度增加明显。当冷变形量从0%增加到70%时,0.25%N 试验合金的抗拉强度从764 MPa提高到1405 MPa,屈服强度从390 MP提高到1249 MPa。在低变形量时,试验合金中存在大量位错和平面滑移结构。随着冷变形量的增加,试验合金中形变孪晶的数量逐渐增加,位错不断增殖。当冷变形量继续增加时,形变孪晶被割裂破碎。

Effect of cold deformation on microstructure and mechanical properties of 028 alloy containing nitrogen

Effect of cold rolling deformation on microstructure and mechanical properties of 028 alloy containing nitrogen was studied by means of optical microscope (OM), transmission electron microscope (TEM) and tensile test. The results show that when the amount of cold deformation is the same, the yield strength increases obviously with the increase of nitrogen content. When the cold deformation is increased from 0% to 70%, the tensile strength of the 0.25%N tested alloy is increased from 764 MPa to 1405 MPa, and the yield strength is increased from 390 MP to 1249 MPa. At low deformation, there are a large number of dislocations and plane slip structures in the alloy. With the increase of cold deformation, the number of deformation twins in the alloy increases gradually, and the dislocations multiply continuously. When the cold deformation continues to increase, the deformation twins are split and broken.