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首页> 外文期刊>Journal of Materials Engineering and Performance >Characterization of Bimetallic Castings with an Austenitic Working Surface Layer and an Unalloyed Cast Steel Base
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Characterization of Bimetallic Castings with an Austenitic Working Surface Layer and an Unalloyed Cast Steel Base

机译：具有奥氏体工作表面层和非合金铸钢基底的双金属铸件的特性

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摘要

The paper presents the technology of bimetallic castings based on the founding method of layer coating directly in the cast process of the so-called method of mold cavity preparation. The prepared castings consist of two fundamental parts, i.e., the base and the working surface layer. The base part of the bimetallic casting is typical foundry material, i.e., unalloyed cast steel, whereas the working layer is a plate of austenitic alloy steel sort X2CrNi 18-9. The quality of the joint between the base part and the working layer was evaluated on the basis of ultrasonic non-destructive testing and structure examinations containing metallographic macro- and microscopic studies with the use of a light microscope (LOM) with microhardness measurements and a scanning electron microscope (SEM) with microanalysis of the chemical composition (energy dispersive spectroscopy - EDS). On the basis of the obtained results it was confirmed that the decisive phenomena needed to create a permanent joint between the two components of the bimetallic casting are carbon and heat transport in the direction from the high-carbon and hot base material which was poured into the mold in the form of liquid metal to the low-carbon and cold material of the working layer which was placed in the mold cavity in the form of a monolithic insert.
机译：本文介绍了基于直接在所谓的型腔制备方法的铸造过程中形成涂层的建立方法的双金属铸造技术。制备的铸件包括两个基本部分，即基础和工作表面层。双金属铸件的基础部分是典型的铸造材料，即非合金铸钢，而工作层是奥氏体合金钢X2CrNi 18-9类的板。基础部分和工作层之间的连接质量在超声波无损检测和结构检查的基础上进行评估，该检查包含金相宏观和微观研究，并使用光学显微镜（LOM）进行显微硬度测量和扫描电子显微镜（SEM）进行化学成分的微观分析（能量分散光谱法-EDS）。根据获得的结果，可以确定，在双金属铸件的两个组件之间建立永久连接所需要的决定性现象是碳和热量，这些热量是从注入高碳和热基础材料的方向传热的。将液态金属模制成工作层的低碳和冷材料，然后将其以整体式插入物的形式放置在模腔中。

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