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| 1 | 回火工艺对含Ce轴承钢440C组织性能影响显示文摘为探究不同回火工艺对440C轴承钢组织性能的影响,以含Ce超洁净440C轴承钢为研究对象,通过SEM、XRD、TEM等对比研究了球化退火-淬火-回火工艺与球化退火-淬火-回火-冷处理-回火工艺对440C轴承钢显微组织与性能的影响。试验选择的淬火温度为1 050℃、回火温度为200℃、冷处理温度为-78.5℃。结果表明,两种工艺下试验钢中的物相均为马氏体+残余奥氏体+M_(23)C_(6)型碳化物。相比于仅对试验钢进行球化退火-淬火-回火的情况,在球化退火-淬火-回火-冷处理-回火工艺条件下,试验钢中残余奥氏体的体积分数由11.06%降至7.63%,一次碳化物的尺寸及数量基本无变化,二次碳化物的个数增加了49.4%、平均面积下降了24.0%;在力学性能方面,冲击功由90.5 J提高到115.0 J,拉伸试样断后伸长率由5.3%增加到8.3%,而抗拉强度仅由2 039.24 MPa增加到2 060.14 MPa,洛氏硬度由58.70HRC提升到59.09HRC,提升幅度较小。力学性能的转变归因于组织及碳化物的共同作用,本试验条件下球化退火-淬火-回火-冷处理-回火工艺更有利于440C轴承钢韧塑性的提升,但对强度和硬度提升有限。本研究为440C轴承钢在回火工艺的设计提供了参考。 | 马帅 李阳 姜周华 孙萌 毛昀惬 马彦硕 | 2023 | 中国冶金2023，33，8： | 1 |
| 2 | Enrichment characteristic of carbon atoms in solid-liquid zone of high carbon steel under different directional solidification rates显示文摘To reveal the formation mechanism and main influencing factors of C-segregation in high carbon steel under different solidification rates(40,80,160,200 and 320μm·s^(-1)),the enrichment characteristics of carbon atoms in the solid-liquid zone of Fe-0.61%C steel were studied using a zone melting liquid metal cooling apparatus and electron probe microanalysis.The relationships among micro-segregation of carbon atoms,solid-liquid interface morphology and solidification rate were fully discussed.The results show that large dendrite spacing and a slow-moving dendritic interface create less resistance and more time for the migration of interdendritic carbon atoms to liquid zone.This results in the continuous enrichment of carbon atoms in liquid zone,further expands the solid-liquid temperature range,prolongs the solidification time of molten steel,and causes the formation of carbon micro-segregation at the solidification end as the solidification rate is 40μm·s^(-1).Conversely,abundant and elongated secondary dendrite arms with small spacing seriously impede the diffusion of interdendritic carbon-rich molten steel to liquid zone.As a result,there is only obvious dendrite segregation,but little difference in the carbon content along the solidification direction as solidification rate exceeds 200μm·s^(-1). | Yong Wan Shan Gao Meng-hua Li Li-qiang Zhang Yong-hong Wen Ming-ming Song | 2021 | China Foundry2021，18，5： | 0 |
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