Investigation of the Effects of La Addition on Microstructure and Friction Performance of High-Speed Steel Rolls

被引：0
作者：
Wang, Simin [1 ]
Li, Haonan [2 ]
Qiao, Guiying [1 ]
Peng, Longsheng [3 ]
Wang, Yi [3 ]
Xiao, Furen [1 ]
机构：
[1] Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Hebei Key Lab Optimizing Met Prod Technol & Perfor, Qinhuangdao 066004, Hebei, Peoples R China
[2] Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Heavy Met Deep Remediat Water & Reso, Qinhuangdao 066004, Hebei, Peoples R China
[3] Hunan Lifang Roller Co Ltd, Hunan Adv Mfg Engn Technol Res Ctr High Wear Resis, Hunan 421600, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2024年 / 55卷 / 06期
基金：
中国国家自然科学基金;
关键词：
RARE-EARTH; WEAR-RESISTANCE; MECHANICAL-PROPERTIES; CARBON; CERIUM; TOUGHNESS; LANTHANUM; IRON; TRANSFORMATION; CARBIDES;
D O I：
10.1007/s11663-024-03299-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Refinement of the as-cast microstructure of high-speed steel (HSS) rolls is one of the most effective ways to improve the service performance significantly. In this paper, the effect of La from 0.25 to 1.0 wt pct added in HSS rolls on microstructure and wear resistance were studied by means of OM, XRD, SEM and TEM. The result shows that the as-cast microstructure of HSS mainly consists of pro-eutectic austenite (gamma-Fe), eutectic of MC (NbC and VC) + gamma-Fe, and eutectic of M6C + gamma-Fe. While, The addition of La in (HSS) rolls forms inclusions of La2O2S. The inclusions of La2O2S can become the nuclei of pro-eutectic austenite to refine as-cast microstructure, and the size of pro-eutectic austenite, MC + gamma-Fe and M6C + gamma-Fe eutectic colonies decreases, meanwhile, the eutectic carbides of MC and M6C change from rod shape to globular shape. However, the size of La2O2S is the smallest when the addition of La is 0.25 pct, and the size of La2O2S increases when the addition of La is 0.5 and 1 pct. As a result, the refining effect of HSS is the best when adding La is 0.25 pct. The heat treatment has little effect on eutectic carbides, while, mainly improves the microstructure uniformity and properties of the matrix. The wear resistance of HSS rolls after heat treatment is significantly improved by the addition of La, and the effect of refined microstructure on wear resistance was discussed.
引用
收藏
页码：4676 / 4691
页数：16
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