摘要
钢铁材料干摩擦接触表层在较高的法向载荷和滑动速度条件下将产生严重的塑性变形,其内部结构将发生演变。结构演变过程包括晶粒被拉长、细化和纳米化,这些变化将直接影响磨损裂纹的萌生与扩展行为。对干摩擦过程中的应力应变进行计算分析,采用聚焦粒子束定位切割制样(FIB)和高分辨透射表征(HRTEM)技术研究马氏体钢干摩擦过程中的结构演变力学条件和微观机制。结果表明:在干摩擦过程中产生的累积应力应变条件下,严重塑性变形层形成了纳米层片结构,裂纹将首先萌生于这些结构内部。该研究为评估干摩擦接触表层的应力应变条件、分析板条马氏体在塑性变形层的结构演变规律和揭示磨损裂纹形成机制提供了理论基础。
The structural evolution is induced by severe plastic deformation under high normal loads and sliding speeds in dry sliding friction of steels.The structural evolution process involves the elongation,refinement and nanocrystallization of the grains,which directly affect the initiation and propagation behavior of the wear cracks.The stress and strain during dry sliding friction were calculated and analyzed.The mechanical evolution conditions and microscopic mechanism of structural evolution in the dry friction process of martensitic steel were studied by focused ion beam cutting(FIB)and high resolution transmission characterization(HRTEM)techniques.The results show that under the condition of cumulative stress and strain generated during dry friction,the severe plastic deformation layer forms nano-lamellar structures,and micro-cracks will initiate inside these structures.This study provides a theoretical basis for evaluating the stress-strain in friction-induced layer during a dry sliding friction and reveals the relationship between the structural evolution of lath martensite in the plastic deformation layer and the mechanism of wear crack formation.
作者
尹存宏
梁益龙
YIN Cun-hong;LIANG Yi-long(College of Mechanical Engineering,Guizhou University,Guiyang 550025,Guizhou,China;Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials,Guiyang 550025,Guizhou,China;College of Materials Science and Metallurgical Engineering,Guizhou University,Guiyang 550025,Guizhou,China;National and Local Joint Engineering Laboratory for Highr Performance Metal Structure Materials and Advanced Manufacturing Technology,Guizhou University,Guiyang 550025,Guizhou,China;Institute of Metal Materials and Mechanical Strength,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2020年第4期322-328,共7页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51671060)
中国博士后科学基金资助项目(2019M660041XB)。
