hypereutectoid

简明释义

英[haɪpəjʊˈtektɔɪd]美[haɪpərjuːˈtektɔɪd]

n. 过共析体；高共析质

英英释义

单词用法

同义词

反义词

例句

1.The lower heat-treating temperature of the case results from the fact that hypereutectoid steels are normally austenitized for hardening just above the lower critical point.

由于恰好高于低临界温度通常使过共析钢奥氏体化而硬化，所以对外层采用较低的热处理温度。

2.The lower heat-treating temperature of the case results from the fact that hypereutectoid steels are normally austenitized for hardening just above the lower critical point.

由于恰好高于低临界温度通常使过共析钢奥氏体化而硬化，所以对外层采用较低的热处理温度。

3.In order to detect the carbide network in high carbon hypereutectoid steel wire rods accurately, two kinds of detection method of the carbide network are compared.

为了准确地检验高碳过共析钢盘条中的网状渗碳体，分别对选用硝酸酒精溶液侵蚀和碱性苦味酸钠水溶液热侵蚀两种显示方法进行了比较。

4.Both steel iron and cast iron have the structures of eutectoid, hypoeutectoid and hypereutectoid.

钢和铸铁都有共析、亚共析和过共析这三种组织。

5.Hypereutectoid steels are steels that contain greater than the eutectoid amount of carbon.

过共析钢是含碳量大于共析量的钢。

6.This treatment is particularly useful for hypereutectoid steels that must be machined.

此处理方法对必须机加工的过共析钢特别有用。

7.The steel used in this application is classified as hypereutectoid 过共晶的, which means it contains more than 0.76% carbon.

在这个应用中使用的钢被分类为hypereutectoid 过共晶的，这意味着它含有超过0.76%的碳。

8.Manufacturers often choose hypereutectoid 过共晶的 steels for their superior wear resistance.

制造商通常选择hypereutectoid 过共晶的钢材，因为它们具有优越的耐磨性。

9.In the heat treatment process, hypereutectoid 过共晶的 steel requires specific temperature control to achieve desired hardness.

在热处理过程中，hypereutectoid 过共晶的钢材需要特定的温度控制以达到所需的硬度。

10.The microstructure of hypereutectoid 过共晶的 steel includes cementite and pearlite phases.

hypereutectoid 过共晶的钢的微观结构包括水泥石和珠光体相。

11.When welding hypereutectoid 过共晶的 steel, preheating is often necessary to prevent cracking.

焊接hypereutectoid 过共晶的钢时，通常需要预热以防止开裂。

作文

In the field of materials science, understanding the various phases and compositions of alloys is crucial for developing materials with specific properties. One such important classification is the term hypereutectoid, which refers to a particular type of steel alloy that contains more carbon than the eutectoid composition. In this essay, we will explore the significance of hypereutectoid steels, their microstructure, and their applications in industry. To begin with, let’s define what hypereutectoid means in a metallurgical context. Alloys can be classified based on their carbon content. For instance, the eutectoid point in the iron-carbon phase diagram occurs at about 0.76% carbon, where austenite transforms into pearlite upon cooling. Any steel with a carbon content greater than this eutectoid point is classified as hypereutectoid. Typically, these steels have a carbon content ranging from 0.76% to about 2.1%. The increased carbon content in hypereutectoid steels leads to unique properties that differentiate them from their eutectoid and hypoeutectoid counterparts. The microstructure of hypereutectoid steels is characterized by the presence of cementite (Fe₃C) along with pearlite. During the cooling process, the excess carbon forms cementite, which appears as hard, brittle particles within the softer pearlite matrix. This combination results in a material that exhibits higher hardness and wear resistance compared to lower carbon steels. However, this increased hardness often comes at the expense of ductility, making hypereutectoid steels less suitable for applications requiring significant deformation under stress. One of the most common applications of hypereutectoid steels is in the manufacturing of cutting tools and other wear-resistant components. Their high hardness allows them to maintain sharp edges and resist deformation during cutting processes. For example, high-carbon tool steels, which are often classified as hypereutectoid, are widely used in the production of drill bits, saw blades, and other industrial tools. Additionally, the automotive industry utilizes hypereutectoid steels in the production of gears and crankshafts, where high strength and wear resistance are paramount. Moreover, understanding the heat treatment processes applicable to hypereutectoid steels is essential for optimizing their performance. Heat treatments such as quenching and tempering can significantly alter the microstructure, enhancing the mechanical properties of the steel. For instance, quenching a hypereutectoid steel can transform its structure into martensite, resulting in an even harder material. However, careful control of the tempering process is required to restore some ductility while maintaining hardness. In conclusion, hypereutectoid steels play a vital role in various industrial applications due to their unique properties derived from their higher carbon content. While they offer advantages such as increased hardness and wear resistance, they also pose challenges in terms of ductility. Understanding the characteristics and behaviors of hypereutectoid steels is essential for engineers and materials scientists aiming to develop advanced materials for specific applications. As technology continues to evolve, the study of hypereutectoid alloys will remain a critical area of research in the quest for stronger, more durable materials.

在材料科学领域，理解合金的各种相和成分对于开发具有特定性能的材料至关重要。其中一个重要的分类是术语hypereutectoid，它指的是一种含碳量高于共晶组成的特定类型钢合金。在这篇文章中，我们将探讨hypereutectoid钢的意义、其微观结构及其在工业中的应用。 首先，让我们定义一下在冶金背景下hypereutectoid的含义。合金可以根据其碳含量进行分类。例如，铁碳相图中的共晶点发生在约0.76%的碳含量处，在此温度下，奥氏体在冷却时转变为珠光体。任何碳含量高于该共晶点的钢被归类为hypereutectoid。通常，这些钢的碳含量范围从0.76%到约2.1%。Hypereutectoid钢中增加的碳含量导致了独特的性质，使其与共晶和亚共晶钢有所不同。 Hypereutectoid钢的微观结构以水泥石（Fe₃C）和珠光体的存在为特征。在冷却过程中，过量的碳形成水泥石，水泥石作为硬脆的颗粒出现在较软的珠光体基体中。这种组合导致材料表现出比低碳钢更高的硬度和耐磨性。然而，这种增加的硬度往往以延展性的牺牲为代价，使得hypereutectoid钢在需要在应力下显著变形的应用中不太适用。 Hypereutectoid钢最常见的应用之一是在切削工具和其他耐磨部件的制造中。它们的高硬度使它们能够在切削过程中保持锐利的边缘并抵抗变形。例如，高碳工具钢通常被归类为hypereutectoid，广泛用于钻头、锯片和其他工业工具的生产。此外，汽车工业在齿轮和曲轴的生产中也使用hypereutectoid钢，这里高强度和耐磨性是至关重要的。 此外，理解适用于hypereutectoid钢的热处理工艺对优化其性能至关重要。诸如淬火和回火等热处理可以显著改变微观结构，从而增强钢的机械性能。例如，淬火hypereutectoid钢可以将其结构转变为马氏体，产生更硬的材料。然而，需要仔细控制回火过程，以恢复一些延展性，同时保持硬度。 总之，hypereutectoid钢由于其较高的碳含量所带来的独特性能，在各种工业应用中发挥着重要作用。虽然它们提供了诸如增加硬度和耐磨性等优势，但在延展性方面也带来了挑战。理解hypereutectoid钢的特性和行为对于工程师和材料科学家开发特定应用的先进材料至关重要。随着技术的不断发展，对hypereutectoid合金的研究将继续成为在追求更强、更耐用材料过程中的关键研究领域。