用微压痕法评估建筑钢材的脆性

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
A. E. Zorin, A. S. Romantsov
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引用次数: 0

摘要

摘要 金属的机械特性由三组因素共同决定:化学成分、结构特征和结构的变形能力,即元素在变形过程中通过位错滑动放松内应力而不会导致裂纹形成和破坏的能力。利用微压痕技术评估延展性相对较高的结构钢的结构变形能力是本研究的目标。理论分析表明,金属刚度的增加和塑性的降低会导致压痕过程中变形模型的改变,特别是在压痕附近的表面会出现各种形态的变形效应,这可以表明金属的塑性。对不同强度和结构类型的管材钢进行的实验研究证实,随着金属变形能力的降低(主要是变形硬化的结果),在压痕附近会沿着最大切向应力的作用线形成局部剪切系统。提出了一种局部剪切数据排序表,并确定了通过微压痕获得最大信息的最佳载荷值和压头形状。根据微压痕的结果,开发了一种评估塑性建筑钢材脆性的方法,该方法可为创建金属状态无损评估的有效技术奠定基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of Embrittlement of Construction Steels by Microindentation

Evaluation of Embrittlement of Construction Steels by Microindentation

Abstract

The mechanical characteristics of a metal are determined by a combination of three groups of factors: the chemical composition, the structural features, and the deformation ability of the structure, i.e., the ability of elements to relax internal stresses during deformation through dislocation sliding which does not lead to the crack formation and destruction. The possibility of using microindentation to assess the deformation ability of the structure of structural steels with a relatively high ductility is the goal of the study. The theoretical analysis revealed that an increase in the stiffness and a decrease in the plasticity of a metal leads to a change in the deformation model during indentation and, in particular, to the occurrence of deformation effects of various morphologies on the surface near the imprint, which can be indicative of the metal plasticity. Experimental studies performed on pipe steels of various strength and types of structure confirmed that, as the deformation ability of the metal decreases (primarily as a result of deformation hardening), a system of localized shears is formed near the imprint along the lines of action of maximum tangential stresses. A scale for ranking data of localized shears is proposed, and the optimal load value and shape of the indenter which provide gaining maximum information by microindentation are determined. A methodology for assessing the embrittlement of plastic construction steels on the basis of the results of microindentation has been developed, which can form a basis for creating an effective technology of nondestructive evaluation of the metal state.

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来源期刊
Inorganic Materials
Inorganic Materials 工程技术-材料科学:综合
CiteScore
1.40
自引率
25.00%
发文量
80
审稿时长
3-6 weeks
期刊介绍: Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.
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