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原位自生NbC/H13钢复合材料抗磨损性能研究
Study on the Wear Resistance of In-situ NbC/H13 Steel Composites
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- DOI:
- 作者:
- 刘洲 周谟金 蒋业华 隋育栋
LIU Zhou, ZHOU Mojin, JIANG Yehua, SUI Yudong
- 作者单位:
- 昆明理工大学金属先进凝固成形及装备技术国家地方联合工程研究中心
National & Local Joint Engineering Research Center of Advanced Metal Solidification Forming and Equipment Technology, Kunming University of Science and Technology, Kunming 650000, China
- 关键词:
- 原位自生;NbC;H13钢;显微组织;冲击韧性;耐磨性;
in situ; NbC; H13 steel; microstructure; impact toughness; wear resistance
- 摘要:
- H13钢作为盾构机刀圈材料,主要用于破碎坚硬岩石。在盾构机掘进过程中,刀圈的磨损是不可避免的,过度的磨损会导致掘进效率的降低,增加施工风险。为了提高H13钢的耐磨性,采用重力铸造原位自生的方法,制备了体积分数为1%、3%、5%的原位自生NbC/H13钢复合材料。采用金相显微镜、扫描电子显微镜对复合材料的物相组成与组织结构进行分析,使用冲击试验机、三体磨料磨损试验机对不同体积分数NbC/H13钢复合材料的冲击韧性、磨料磨损性能进行研究。结果表明,制备的复合材料组织致密,NbC增强相在基体中弥散分布。随着增强相体积分数提高,增强相的形态由网状逐渐向小棒状和颗粒状转变;复合材料的冲击韧性值随着增强相的体积分数提高逐渐下降,当NbC含量在5%(体积分数)时,冲击韧性到最小值6.5 J;三体磨料磨损结果表明,随着NbC体积分数的增加,有效减少磨料对钢基体的磨损,从而进一步提高了复合材料的耐磨性,与基体材料相比,耐磨性提高了2.1倍。
H13 steel is used as a shield machine cutter ring material, mainly for breaking hard rock. In the process of shield machine tunneling, the wear and tear of the cutter ring is inevitable, and excessive wear and tear will lead to areduction in tunneling efficiency and increase the construction risk. To improve the wear resistance of H13 steel, in situ NbC/H13 steel composites with volume fractions of 1%, 3% and 5% were prepared by the gravity casting in situ method. Metallographic microscope and scanning electron microscope were used to analyse the physical composition and microstructure of the composites, and the impact toughness and abrasive wear properties of NbC/H13 steel composites with different volume fractions were studied using an impact testing machine and a three-body abrasive wear testing machine. The results show
that the prepared composites are dense and the NbC reinforcing phase is diffusely distributed in the matrix. With the increasing volume fraction of the reinforcing phase, the shape of the reinforcing phase changes from reticular to rod-shaped and granular. The impact toughness of the composites decreases with the increasing volume fraction of the reinforcing phase. When the NbC content is 5%(volume fraction), the impact toughness reaches the minimum value of 6.5 J. The results of three-body abrasive wear show that with the increase of NbC volume fraction, the wear of the steel matrix by the abrasive is effectively reduced, thus further improving the wear resistance of the composites. Compared with the matrix material, the wear resistance is increased by 2.1 times.