铝合金压铸模具钢Y10Y10模具钢(4Cr5Mo2MnVSi)是专为铝合金压铸模具而研制的。与3Cr2W8V钢相比，它具有抗冷热疲劳性能好、热处理变形小、抗铝溶损性能好等优点。2.2.1化学成分（wt%）元素CCrMnMoVSiNiCuSP含量0.364.870.932.031.101.230.070.070.0090.0252.2.2物理性能a.临界点Ac1=815℃Ac3=893℃Ms=271℃2.2.3室温性能2.2.3.1硬度：回火温度(℃)450500550600620640680硬度HRC5656~5953.5~5547~48.540~4331.5~3429~30.52.2.3.2拉伸：σb(MPa)σs(MPa)δ(%)ψ(%)1724.11562.75.420.882.2.3.3冲击韧性：15.6J/cm22.2.3.4断裂韧性KIC：试样尺寸10×20×100mm58.36MN/m3/22.2.4高温性能2.2.4.1***化性能：700℃时间(h)2515253545556580100氧化增重(g/m2)0.30.30.50.81.31.82.32.83.75.0750℃时间(h)258111520253035404550氧化增重(g/m2)0.91.93.64.96.07.69.010.211.312.414.416.3800℃时间(h)24681012141618202224氧化增重(g/m2)5.517.731.552.777.5102.3128.7159.3187215.5249.2274.9850℃时间(h)12345678910氧化增重(g/m2)8.521.644.373.5102.1135.9168.8204.6240.1274.61000℃时间(h)1234氧化增重(g/m2)88.1195.8270.7323.32.2.4.2热稳定性能：640℃时间(h)02481117硬度HRC44.636.733.931.229.728.6660℃时间(h)01235912硬度HRC45.536.433.031.228.928.528.3680℃时间(h)00.511.5234硬度HRC45.534.432.031.429.729.428.3700℃时间(h)00.511.523硬度HRC44.230.730.228.628.527.42.2.4.3高温硬度：温度(℃)300450600650700750硬度HRC406.3387.0354.0313.7245.7185.72.2.4.4高温拉伸：性能温度(℃)σb(MPa)σs(MPa)δ(%)ψ(%)3001318.61122.310.848.2600803.3716.125.778.3650527.0469.8268.087.3700274.4224.341.095.32.2.4.5高温冲击：温度(℃)300600650700α(J/cm2)31.348.752.160.52.2.4.6热疲劳：裂纹大小1级2级3级4级5级6级7级7.5级8.5级9.5级10级a(mm)0.0030.0040.0050.0080.010.0120.0150.0180.020.025≥0.03密度3级4级5级6级7级8级9级10级b(mm)0.050.0750.100.120.150.200.250.30网状程度按lars-Akenorstroem图谱循环温度(℃)热疲劳性能横向裂纹宽度级别裂纹密度级别网状程度级别主裂纹宽度级别纵向裂纹宽度级别总的热疲劳平均级别150↔650(1000N)2.333.53.532.47150↔750(1000N)53.554.57.55.335.554.334.67.555.675.422.2.4.7热磨损：热磨损温度(℃)润滑方法磨损次数和失重值(mg)300次600次900次1200次1500次2500次850~95032#内燃机油0.470.60.931.031.171.422.2.4.8热熔损试样尺寸：ϕ36×4.6mm，加热介质：ZL102铝，保温4小时。热熔损温度(℃)工况失重值(g/dm2)620℃×4小时试样500℃烘烤30’入铝液试样旋转速度9转/分（同轴心转）3.0839680℃×4小时试样未经烘烤直接入铝液试样旋转线速度2.26米/分10.7680℃×3小时+714℃×1小时试样500℃烘烤30’入铝液试样旋转线速度2.26米/分46.52.2.4.9热处理变形性：采用U.S．N***YC型试样，名义尺寸为A=Φ60mm，B=Φ35mm，C=12.7mm，D=6mm，按推荐热处理规范处理，测量处理前后各部位变形量，如表所示：钢种各部位变形量(mm)部位A部位B部位C部位DSRIMY10+0.046+0.023+0.009+0.0613Cr2W8V+0.053+0.087+0.031+0.319图2.1U．S．N***YC型试样示意图2.2.5工艺性能锻造温度范围1100～850℃，锻后坑冷或砂冷。经850℃退火后，HB170～235。淬火温度1000～1060℃，回火温度550～630℃，回火后硬度HRC42~50。Y10模具钢的锻造、切削、热处理等工艺性能良好。2.2.6应用实例：压铸模名称原3Cr2W8V模具寿命（万次）Y10模具寿命（万次）汽车变速箱上盖模3~52271-4P电机端盖模338120照相机盒模530)