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高碳铬滚动
轴承钢的化学成分牌号标准化学成分（质量分数%）CSiMnCrMoNi≤Cu≤P≤S≤GCr4GB/T 18254-20020.95~1.050.15~0.300.15~0.300.35~0.50≤0.080.250.300.0250.020GCr150.95~1.050.15~0.350.25~0.451.04~1.65≤0.100.300.250.0250.025GCr15SiMn0.95~1.050.45~0.750.95~1.251.40~1.65≤0.100.300.250.025.0.025GCr15SiMo0.95~1.050.65~0.850.20~0.401.40~1.700.30~0.400.300.250.27~0.020GCr18Mo0.95~1.050.20~0.400.25~0.401.65~1.950.15~0.250.250.250.0250.020高碳铬滚动轴承钢的力学性能GCr15室温力学性能试样状态ób/MPaós/MPaó5(%)ψ(%)αk/MPaóbb/MPa硬度￠30mm退火6373872551.574198HBW￠17mm退火6083631858190~207HBW锻料退火65317.355.969.6190~202HBW各种品种退火598~715372~41215~2525~4044170~207HBW900℃正火锻材120040~42HRC冷轧9818831045300HBW淬火、回火状态2155~25501665~1815680HV830℃淬火，150℃回火*2H1960830℃淬火，160℃回火*2.5H7.35~8.5861~65HRC断裂韧度疲劳极限热处理工艺洛氏硬度HRC断裂韧度KIC/MPa*m1/2热处理工艺HRCó-1/MPa循环次数/次真空热处理59.4~59.918.95840℃油，160℃回火*2H63~647361.5*107空气炉热处理59.116.80空气热处理59.115.92GCr15SiMn室温力学性能热处理工艺ób/MPaó5(%)ψ(%)óbb/MPa硬度退火72112.757.0170~207HBW830℃淬火，500℃回火*2H142521.739HRC830℃淬火，180℃回火*1.5H272562HRC回火温度对GCr15SiMn钢接触疲劳寿命的影响温度/℃150180200250300350400疲劳寿命/H18.214.19.66.62.31.6GCr15SiMoGCr15SiMo钢的接触疲劳寿命热处理工艺额定寿命L10/*107次中值寿命L50/*1腐蚀速度07次特征寿命V/*107次斜率860℃油淬，186℃回火2.5H1.13713.33814.11621.7494注：淬火、回火后的硬度为62.2~63HRCGCr15SiMo钢的断裂韧度组织热处理工艺KIC/MPa*m1/2HRC贝氏体870℃淬火，230~240℃硝盐*4H22.7560马氏体860℃油淬，180℃*2H17.2362马氏体840℃油淬，180℃*2H17.0861GCr18Mo力学性能状态ób/MPaós/MPaó5(%)ψ(%)布氏硬度退火6673732760200HBW不同淬火加热温度下的力学性能试样编号加热温度/℃硬度HRC冲击韧度αk/(J/cm2)抗弯强度óbb/MPa断裂韧度KIC/MPa*M1/2耐磨性/(W/mm3)185560.598.43321.720.60.02478286560.2111.63686.522.60.02395388059.8118.63831.722.00.02633GCr18Mo钢不同等温时间下的力学性能试样编号等温时间/H硬度HRC抗弯强度óbb/MPa断裂韧度KIC/MPa*M1/2耐磨性/(W/mm3)11613360.1521.40.0239522603435.7523.10.0209534603686.522.60.02395GCr18Mo钢不同等温温度和等温时间下的力学性能试样编号加热温度/℃硬度HRC冲击韧度αk/(J/cm2)抗弯强度óbb/MPa断裂韧度KIC/MPa*M1/2耐磨性/(W/mm3)122560.581.22982.1520.10.02297223560111.63686.522.60.02395324559.0128.83750.320.150.02495注：加热温度为865℃，等温时间为4HGCr18Mo钢接触疲劳寿命序号显微组织额定寿命L10/*106次中值寿命L50/*107次斜率α1贝氏体4.091.401.532贝氏体+马氏体2.370.761.67断裂韧度KIC牌号KIC/MPa*M1/2以GCr15的KIC为1.0的提高倍数GCr432.091.67GCr1519.161.0GCr4和GCr15钢的接触疲劳寿命牌号工艺L10/*107次以GCr15为1的倍数L50/*103次以GCr15为1的倍数斜率αGCr4预热+加热+喷水+淬火+回火5.311.262.211.191.33预热+加热+直接淬火+回火4.311.122.081.121.28GCr15常规淬火+回火4.211.01.811.01.27