等通道挤压和时效处理对1RK91不锈钢力学性能的影响OA
Effects of equal channel angular pressing and aging on the mechanical properties of 1RK91 stainless steel
对经过不同道次等通道挤压(equal channel angular pressing,ECAP)和时效处理的1RK91 不锈钢试样进行了金相观察、X 射线衍射仪(X-ray diffractometer,XRD)物相检测、拉伸测试和硬度检测.结果发现,1RK91 不锈钢在ECAP过程中发生了应变诱发马氏体转变,这与位错的扩散和迁移密切相关.经过 5 道次ECAP处理后,试样的屈服强度从初始的 373 MPa提高到478 MPa,位错密度从 4.10×1010 cm−2 增加到 7.98×1010 cm−2.在经 500℃下时效处理 2 h后,试样的峰值维氏硬度提高到 395.450℃时效 30 min随后 500℃时效 90 min处理后,试样表现出更高的峰值维氏硬度,为 429.经 5 道次ECAP处理后试样的自腐蚀电势达到最大,为−0.324 V,自腐蚀电流密度为 0.445×10−6 A/cm2,耐腐蚀性提高.
Metallographic observation,X-ray diffractometer(XRD)phase analysis,tensile test and hardness measurement were carried out on 1RK91 stainless steel specimens subjected to different passes of equal channel angular pressing(ECAP)and aging treatment.The results showed that strain-induced martensitic transformation occurred in 1RK91 stainless steel during ECAP,which was closely related to the diffusion and migration of dislocations.After 5 passes of ECAP treatment,the yield strength of the specimens increased from the initial 373 MPa to 478 MPa,and the dislocation density increased from 4.10×1010 cm−2 to 7.98×1010 cm−2.After aging treatment at 500℃for 2 h,the peak Vickers hardness of the specimens increased to 395.When aged at 450℃for 30 min followed by aging at 500℃for 90 min,the specimens exhibited a higher peak Vickers hardness of 429.The specimens treated with 5 passes of ECAP achieved the maximum self-corrosion potential of −0.324 V and a self-corrosion current density of 0.445×10−6 A/cm2,indicating improved corrosion resistance.
陈义楠;何代华;祁胜财;张柯;陈小红;马凤仓
上海理工大学 材料与化学学院,上海 200093上海理工大学 材料与化学学院,上海 200093上海市口腔医院修复科 上海市颅颌面发育与疾病重点实验室,上海 200031上海理工大学 材料与化学学院,上海 200093上海理工大学 材料与化学学院,上海 200093上海理工大学 材料与化学学院,上海 200093
医药卫生
1RK91不锈钢等通道挤压应变诱发马氏体时效处理
1RK91 stainless steelequal channel angular pressingstrain-induced martensiteaging treatment
《有色金属材料与工程》 2026 (1)
17-26,10
国家自然科学基金资助项目(51771119)上海自然科学基金资助项目(17ZR1419600)和上海高校医疗器械材料工程技术研究中心资助项目(20DZ2255500)
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