Nb+V复合微合金化对GCr15钢微观组织和力学性能的影响  

Effect of Nb+V composite microalloying on microstructure and mechanical properties of GCr15 steel

作　　者：梁桃云 朱华明 严红革[1] 陈吉华[1] 夏伟军[1] 苏斌[1] 陶富华 郝凯斌 LIANG Tao-yun;ZHU Hua-ming;YAN Hong-ge;CHEN Ji-hua;XIA Wei-jun;SU Bin;TAO Fu-hua;HAO Kai-bin(School of Materials Science and Engineering,Hunan University,Changsha 410082,China;Trio Metal(GZ)Co Ltd,Guangzhou 511340,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]广州众山精密科技有限公司,广东广州511340

出　　处：《材料热处理学报》2025年第1期114-123,共10页Transactions of Materials and Heat Treatment

摘　　要：为了提高GCr15钢的硬度和强度,对其进行了Nb+V微合金化和不同工艺的热处理,研究了Nb+V微合金化对GCr15钢的奥氏体及珠光体特征和力学性能的影响。结果表明,添加Nb+V元素能够有效地细化GCr15钢的奥氏体晶粒,其原因是固溶态的Nb和V元素对奥氏体晶界有拖曳作用,且(Nb,V)C碳化物对晶界有钉扎作用。在1050℃保温30 min时,GCr15-0.10Nb-0.13V钢的奥氏体晶粒相比GCr15钢细化了37.41%。Nb+V微合金化能够细化珠光体片层间距,促进棒状和粒状珠光体的形成,进而提高钢的抗拉强度和屈服强度。在1200℃保温120 min空冷后,GCr15-0.10Nb-0.13V钢的抗拉强度和屈服强度相比GCr15钢分别提高了132.6和151.5 MPa,伸长率为10.4%。In order to improve the hardness and strength of GCr15 steel,Nb+V microalloying and different heat treatments were carried out,and the effect of Nb+V microalloying on austenite and pearlite characteristics and mechanical properties of the GCr15 steel was studied.The results show that the addition of Nb+V elements can effectively refine the austenite grains of the GCr15 steel,due to the dragging effect of solid solution Nb and V elements on austenite grain boundaries and the pinning effect of(Nb,V)C carbides on grain boundaries.After holding at 1050℃for 30 min,the austenite grain size of the GCr15-0.10Nb-0.13V steel is refined by 37.41%compared to the GCr15 steel.Nb+V microalloying can refine the spacing of the pearlite lamellae,promote the formation of rod-like and granular pearlite,and thereby improve the tensile strength and yield strength of the steel.After holding at 1200℃for 120 min and then air cooling,the tensile strength and yield strength of the GCr15-0.10Nb-0.13V steel increase by 132.6 and 151.5 MPa,respectively,compared to the GCr15 steel,with an elongation of 10.4%.

关 键 词：GCR15轴承钢 Nb+V 微合金化 热处理 力学性能 

分 类 号：TG142.4[一般工业技术—材料科学与工程]