The microstructures, friction and wear behavior under dry sliding condition of electrodeposited amorphous Fe-Co-W alloy deposits heat treated at different temperatures were studied. A comparative study of hard chrome ...The microstructures, friction and wear behavior under dry sliding condition of electrodeposited amorphous Fe-Co-W alloy deposits heat treated at different temperatures were studied. A comparative study of hard chrome deposit under the same testing condition was also made. The experimental results show that the hardness and wear resistance of amorphous Fe-Co-W alloy deposits are improved with the increasing of heat treatment temperature, and reach the maximum value at 800 ℃, then decrease above 800 ℃. Under 40 N load, the wear resistance properties of the alloy deposits heat treated at 800 ℃ are superior to those of hard chrome deposit. The main wear mechanisms of amorphous Fe-Co-W alloy deposits heat treated below 600 ℃ are peeling, plastic and flowing deformation; when the deposits are heat treated above 700 ℃, they are plastic and flowing deformation. While the main wear mechanisms of hard chrome are abrasive wear, fatigue and peeling.展开更多
采用双层辉光离子渗金属技术,在工业纯铁和20钢表面进行W、Mo、Co多元共渗,形成Fe W Mo Co型渗镀复合层.对渗镀层进行了金相组织观察、成分及硬度测量,重点研究了镀层的相组成及镀层与基体间的结合强度.结果表明:纯铁和20钢表面镀层以...采用双层辉光离子渗金属技术,在工业纯铁和20钢表面进行W、Mo、Co多元共渗,形成Fe W Mo Co型渗镀复合层.对渗镀层进行了金相组织观察、成分及硬度测量,重点研究了镀层的相组成及镀层与基体间的结合强度.结果表明:纯铁和20钢表面镀层以金属钨、钼为基体,其上分布大量μ相,并有少量Laves相;镀层硬度高达1000～1400HV,固溶和时效处理对硬度提高影响不大;纯铁表面镀层在渗金属、固溶、时效状态下,持续加载100N未发生镀层剥落现象;20钢表面镀层经固溶处理后,所加载荷在100N内未发生剥落现象,但在渗金属及时效态,当载荷加至80N时,镀层开始剥落.展开更多
The purpose of the present paper isto determine the composition range ofthe θ intermediate phase and establishthe phase equilibria relation in theW-Fe-Co ternary system.The experimentalresult was compared with the ca...The purpose of the present paper isto determine the composition range ofthe θ intermediate phase and establishthe phase equilibria relation in theW-Fe-Co ternary system.The experimentalresult was compared with the calculationof phase diagrams in Guillermet’s work.1.Experimental ProcedureThe diffusion couple specimen usedin this investigation was prepared fromthe tungsten bar (99.96 wt-%),electro-展开更多
文摘The microstructures, friction and wear behavior under dry sliding condition of electrodeposited amorphous Fe-Co-W alloy deposits heat treated at different temperatures were studied. A comparative study of hard chrome deposit under the same testing condition was also made. The experimental results show that the hardness and wear resistance of amorphous Fe-Co-W alloy deposits are improved with the increasing of heat treatment temperature, and reach the maximum value at 800 ℃, then decrease above 800 ℃. Under 40 N load, the wear resistance properties of the alloy deposits heat treated at 800 ℃ are superior to those of hard chrome deposit. The main wear mechanisms of amorphous Fe-Co-W alloy deposits heat treated below 600 ℃ are peeling, plastic and flowing deformation; when the deposits are heat treated above 700 ℃, they are plastic and flowing deformation. While the main wear mechanisms of hard chrome are abrasive wear, fatigue and peeling.
文摘采用双层辉光离子渗金属技术,在工业纯铁和20钢表面进行W、Mo、Co多元共渗,形成Fe W Mo Co型渗镀复合层.对渗镀层进行了金相组织观察、成分及硬度测量,重点研究了镀层的相组成及镀层与基体间的结合强度.结果表明:纯铁和20钢表面镀层以金属钨、钼为基体,其上分布大量μ相,并有少量Laves相;镀层硬度高达1000～1400HV,固溶和时效处理对硬度提高影响不大;纯铁表面镀层在渗金属、固溶、时效状态下,持续加载100N未发生镀层剥落现象;20钢表面镀层经固溶处理后,所加载荷在100N内未发生剥落现象,但在渗金属及时效态,当载荷加至80N时,镀层开始剥落.
文摘The purpose of the present paper isto determine the composition range ofthe θ intermediate phase and establishthe phase equilibria relation in theW-Fe-Co ternary system.The experimentalresult was compared with the calculationof phase diagrams in Guillermet’s work.1.Experimental ProcedureThe diffusion couple specimen usedin this investigation was prepared fromthe tungsten bar (99.96 wt-%),electro-
