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利用光学显微镜、扫描电镜研究了淬火温度(850~1050℃)+600℃回火对NiCrMoV钢组织的影响及其在不同载荷、滑动速度下的耐磨性能。结果表明:热处理后室温组织为铁素体和回火索氏体;硬度随淬火加热温度升高呈先增加后降低的趋势,900℃时达到最大,为41.2 HRC;保持滑动速度30 mm/s,磨损量随载荷增加呈先降后增,摩擦因数随载荷增加呈先减小后增大,900℃淬火样最小;固定载荷100 N,磨损量和摩擦因数随滑动速度增加呈先增后降低,淬火温度950℃时最小;当载荷200 N时,摩擦因数差异最小,在0.44~0.46内波动。低载荷或低速以磨粒磨损为主,高载荷或高速以磨损为主,粘着和磨粒磨损为辅的混合机制。
The effects of quenching temperature (850 ~ 1050 ℃) and tempering at 600 ℃ on the microstructure of NiCrMoV steel and its wear resistance under different loads and sliding velocities were investigated by optical microscope and scanning electron microscope. The results show that the microstructure of the steel is ferrite and tempered sorbite after heat treatment. The hardness increases first and then decreases with the increase of quenching temperature, reaching the maximum of 41.2 HRC at 900 ℃. The sliding speed of 30 mm / s, wear The friction coefficient decreases firstly and then increases with the increase of load, and decreases with the increase of load, and the smallest quenched sample at 900 ℃. With a fixed load of 100 N, the wear amount and friction coefficient increase first and then decrease with the increase of sliding speed, The temperature is the smallest at 950 ℃; when the load is 200 N, the difference of friction coefficient is the smallest, fluctuating within 0.44 ~ 0.46. Low load or low speed abrasive wear-based, high-load or high-speed wear-based, adhesion and abrasive wear, supplemented by a mixed mechanism.