Assessment of the effect of small additions of some rare earth elements on the structure and mechanical properties of castings from hypereutectic chromium white irons

IF 1.4 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY AIMS Materials Science Pub Date : 2023-01-01 DOI:10.3934/matersci.2023029
Aleksander Panichkin, A. Uskenbayeva, A. Kenzhegulov, A. Mamaeva, A. Imbarova, B. Kshibekova, Zhassulan Alibekov, D. Nurhadiyanto, Isti Yunita
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引用次数: 3

Abstract

Article considers the influence of additions of rare earth elements such as Sm, La, Ce, Nd, and Y on the structure and properties of hypereutectic high-chromium white cast iron of grade G-X300CrMo27-2. To obtain an increased content of carbides in the studied cast iron samples, the carbon content was 3.75–3.9 and 4.1–4.2 wt%. The amount of rare earth elements additives added to the melt is 0.2% by weight. Data were obtained on the effect of overheating and cooling rate in the crystallization interval on the effect of rare earth additives, the structure and properties of white cast iron castings are given. According to the results of the microprobe analysis, it was shown that, under the chosen crystallization conditions, Sm, La, and Ce can form solid solutions with primary and eutectic carbides (FeCr)7C3. La and Ce form solid solutions with austenite. Nd and Y do not dissolve in iron chromium phases. All listed rare earth elements form phosphides and oxyphosphides. Experimental data are presented on the effect of rare earth elements on the size of primary (FeCr)7C3 carbides and a hypothesis is proposed on the effect of rare earth elements on the crystallization process of hypereutectic chromium white cast irons. Experimental data are presented on the effect of REE additives on the microhardness of phases, hardness, strength, and resistance to abrasive wear of cast iron castings. It was found that the introduction of these additives into hypereutectic chromium white cast iron does not contribute to the modification of the structure and leads to an increase in the size of primary crystals, as well as a decrease in their mechanical properties. However, the addition of Y increases the abrasive wear resistance, but reduces the strength of castings made from such white cast iron.
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少量添加稀土元素对过共晶白口铬铸铁铸件组织和力学性能影响的评价
本文研究了稀土元素Sm、La、Ce、Nd、Y的添加对G-X300CrMo27-2等高铬过共晶白口铸铁组织和性能的影响。为了提高所研究的铸铁样品中碳化物的含量,碳含量分别为3.75-3.9和4.1-4.2 wt%。稀土元素添加剂添加到熔体中的量按重量计为0.2%。研究了晶化过程中过热和冷却速度对稀土添加剂效果的影响,给出了白口铸铁铸件的组织和性能。微探针分析结果表明,在选定的结晶条件下,Sm、La和Ce可以与初生和共晶碳化物(FeCr)7C3形成固溶体。La和Ce与奥氏体形成固溶体。Nd和Y不溶于铁铬相。所有列出的稀土元素都形成磷化物和氧磷化物。本文给出了稀土元素对初生(FeCr)7C3碳化物尺寸影响的实验数据,并对稀土元素对过共晶铬白口铸铁结晶过程的影响提出了假设。研究了稀土元素对铸铁铸件相显微硬度、硬度、强度和耐磨性的影响。结果表明,在过共晶铬白口铸铁中加入这些添加剂对组织的改变没有作用,反而导致初生晶尺寸增大,力学性能下降。然而,Y的加入增加了磨料耐磨性,但降低了由这种白口铸铁制成的铸件的强度。
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来源期刊
AIMS Materials Science
AIMS Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
0.00%
发文量
33
审稿时长
4 weeks
期刊介绍: AIMS Materials Science welcomes, but not limited to, the papers from the following topics: · Biological materials · Ceramics · Composite materials · Magnetic materials · Medical implant materials · New properties of materials · Nanoscience and nanotechnology · Polymers · Thin films.
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