摘要
本研究系统探讨了GCr15SiMo轴承钢在不同热处理条件下的显微组织演变与力学性能变化。通过定向凝固技术制备铸锭,经轧制处理后,对样品分别进行750,800,850℃的热处理及液氮深冷处理。利用扫描电子显微镜(SEM)和电子背散射衍射(EBSD)技术,详细分析了材料的显微组织特征及碳化物形态演变。结果表明:750℃热处理后,基体主要为铁素体组织,碳化物呈球形且颗粒较大;而800℃和850℃热处理后,基体转变为珠光体和马氏体组织,碳化物经历溶解-再析出过程,分布更加均匀。深冷处理进一步细化了碳化物,显著提高了材料的组织均匀性、强度和韧性。力学性能表明,750℃热处理后材料塑性最佳,而850℃热处理后材料表现出优异的综合性能。本研究通过优化深冷处理工艺,为提升GCr15SiMo轴承钢的综合性能提供了有效的技术方案,为其在工程领域的应用奠定了理论基础。
This study systematically investigates the microstructure evolution and mechanical properties of GCr15SiMo bearing steel under different heat treatment conditions.The ingots were prepared using directional solidification technology and subsequently subjected to rolling.The samples were then heat-treated at 750 C,800 C,and 850 C,followed by cryogenic treatment in liquid nitrogen.The microstructural characteristics and carbide morphology evolution were analyzed in detail using scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD).The results indicate that after 750 C heat treatment,the matrix primarily consists of ferrite,with coarse spherical carbides.In contrast,after 800 C and 850 C heat treatment,the matrix transforms into pearlite and martensite,and the carbides undergo a dissolution-reprecipitation process,resulting in a more uniform distribution.Cryogenic treatment further refines the carbides,significantly enhancing the material's microstructural homogeneity,strength and toughness.Mechanical property analysis reveals that the material exhibits optimal plasticity after 750 C heat treatment,while the 850 C heat-treated sample demonstrates superior comprehensive performance.By optimizing the cryogenic treatment process,this study provides an effective technical solution for improving the overall performance of GCr15SiMo bearing steel,laying a theoretical foundation for its application in engineering fields.
作者
冯美龙
黄良顺
王文超
FENG Meilong;HUANG Liangshun;WANG Wenchao(School of Mechanical Engineering,Jiangxi Polytechnic University,Jiujiang 332007,China)
出处
《兵器材料科学与工程》
2026年第2期88-95,共8页
Ordnance Material Science and Engineering
基金
江西省教育厅科技研究项目(GJJ2404906,GJJ2204811)。
