H13钢表面Fe_2B单相渗硼层的高温摩擦磨损机理

High temperature friction and wear mechanism of Fe_2B monophase borided layer on surface of H13 steel

经过固体渗硼及后续真空热处理在H13钢表面制备得到了Fe2B单相渗硼层,研究了400700℃高温下Fe2B单相渗硼层高温摩擦磨损性能,并探讨了其摩擦磨损机理。结果表明渗硼层的摩擦因数随温度升高呈降低趋势而磨损体积反之;400℃时渗硼层仍具有较好的抗氧化性以及耐磨性能磨损机理主要为轻微氧化磨损以及周期载荷作用下Fe2B柱状晶碎裂产生微裂纹导致的疲劳磨损;在500℃时磨损机理开始向氧化磨损转变;600℃以上磨损机理转变为氧化磨损占主导;700℃时为严重氧化磨损,渗层出现疲劳剥落现象。

Fe2B monophase borided layer was fabricated on H13 steel after the pack boriding treatment and subsequent vacuum heat treatment.The friction and wear mechanism of the Fe2B monophase borided layer at high temperatures in the range of 400-700℃ was investigated.The results show that with temperature increasing,the friction coefficient decreases,the wear volume increases.At the wear test temperature of 400℃,the main wear mechanisms are slight oxidation wear and fatigue wear which is caused by the broken columnar Fe2B under periodic load.At 500℃,the main wear mechanism transforms into oxidation wear.Above 600℃,oxidation wear becomes the dominant wear mechanism.At 700℃,the wear mechanism is severe oxidative wear and fatigue spalling of borided layer appeared.