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借助于光学显微镜和X射线衍射仪等研究了奥氏体不锈钢弹簧丝在经过97.7%的大变形后抗拉强度高达1980 MPa的强化现象。结果表明,钢丝的硬度和抗拉强度随着变形量的增加而升高。在大变形量时,沿拉拔方向的组织趋向纤维化,变形马氏体的体积分数在增加,拉拔钢丝的抗拉强度值升高的幅度增加。分析认为变形强化,纤维组织强化和马氏体相变强化是大变形强化的主要原因。
With the help of optical microscope and X-ray diffractometer, the tensile strength of austenitic stainless steel spring wire up to 1980 MPa after 97.7% deformation has been studied. The results show that the hardness and tensile strength of steel wire increase with the increase of deformation. At large deformations, the organization along the drawing direction tends to fibrillate, the volume fraction of deformed martensite increases, and the increase of the tensile strength value of the drawn wire increases. The analysis shows that deformation strengthening, fiber structure strengthening and martensite transformation strengthening are the main reasons for large deformation strengthening.