锻压技术

不同B含量下钴基合金激光熔覆层组织与性能特征

英文标题：Microstructure and performance characteristics on laser cladding layer for Co-based alloy with different B contents

作者：张志彬舒凤远王慧鹏朱鹏华

单位：1.军事科学院国防科技创新研究院 2.中山大学化学工程与技术学院 3.江西理工大学机电工程学院

关键词：激光熔覆钴基合金粉 B含量微观组织摩擦磨损

分类号：TG139；TH16

出版年,卷(期):页码：2022,47(9):218-223

摘要：

为了提高H13模具钢的表面性能，在其表面激光熔覆一层Co基合金粉，分析了熔覆层的微观组织结构和力学性能。结果表明：熔覆层组织主要由Cr2Ni3、Fe2B、γ-Co和 Co3B等成分构成，随着B含量的升高，Fe、Cr、Co元素的晶化相减少，B化合物增多；从熔覆层底部至顶部，B化合物增多。合金粉末中B含量为7%和19%的试样的熔覆层表面具有优良的耐磨性，在相同磨损条件下，磨损率低，磨损类型主要为磨粒磨损。B含量为11%和15%的试样的熔覆层磨损严重，磨损类型主要为粘着磨损+剥落磨损+氧化磨损，熔覆层出现大量气孔，使得耐磨性能降低，摩擦因数增大，磨损失重增大。B含量为19%时，熔覆层具有大量裂纹。综合考虑，B含量为7%时，熔覆层的组织与性能最佳。

To improve the surface properties of H13 die steel, a layer of Co-based alloy powder was clad on its surface by laser, and the microstructure and mechanical properties of the cladding layer were analyzed. The results show that the microstructure of the cladding layer is mainly composed of Cr2Ni3, Fe2B, γ-Co and Co3B components. With the increasing of B content the crystalline phases of Fe, Cr and Co elements decrease, B compound increases. And from the bottom to the top of the cladding layer, B compound increases. The surfaces of the cladding layer for the samples with the B content of 7% and 19% in the alloy powder have excellent wear resistance property. Under the same wear conditions, the wear rate is low, and the wear type is mainly abrasive wear. However, the cladding layers of the samples with the B content of 11% and 15% are severely worn, and the wear types are mainly adhesive wear + peeling wear + oxidation wear. Furthermore, a large number of pores appear in the cladding layer, which reduce the wear resistance property, increase the friction factor, and increase the wear loss. When the B content is 19%, the cladding layer has a lot of cracks. Thus, comprehensive consideration, when the B content is 7%, the microstructure and performance of the cladding layer are the best.

基金项目：

国家自然科学基金青年基金资助项目（51905126）;北京市自然科学基金资助项目（2212055）

张志彬（1982-），男，博士，副研究员 E-mail：eacbia@163.com 通信作者：王慧鹏（1983-），男，博士，讲师 E-mail：wanghuipeng1983@126.com

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