Degradation of Ship Pipe Metal Due to Long-Term Operation

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strength of Materials Pub Date : 2024-07-29 DOI:10.1007/s11223-024-00648-2

V. D. Makarenko, O. E. Chygyrynets, Yu. L. Vynnykov, V. I. Gots, S. Yu. Maksymov, V. V. Pipa, Yu. V. Makarenko

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Abstract

Previous studies have shown that with increasing service life of shipbuilding steels, a strong hydrogen charging of their internal near-surface layers occurs, especially if the service life exceeds 3 years or more. This is known to cause changes in the mechanical properties of steels. Therefore, there is a need to conduct additional experimental studies on the effect of hydrogen in a wide temperature range on the degradation of the structural and phase states of steels, in particular, on changes in the crystal lattice and redistribution of cementite, which directly leads to a decrease in the ductile and deformation properties of the metal, especially at subzero air temperatures. The effect of service life and subzero temperatures on the stress state of the a-matrix lattice and its parameters for the 10KhSND and D32 steels was investigated. A tendency to increase in the value of lattice distortion stresses and decrease in the mass fraction of cementite in specimens of these steels after long-term operation was revealed. Metallographic studies showed that with decrease in the temperature of the cooling medium, the volume fraction of hydrides increases significantly, which leads to embrittlement and softening of steels.

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长期运行导致的船管金属退化

以往的研究表明，随着造船钢使用寿命的延长，其内部近表面层会出现强烈的氢充电现象，尤其是在使用寿命超过 3 年或更长的情况下。众所周知，这将导致钢的机械性能发生变化。因此，有必要就氢在宽温度范围内对钢的结构和相态退化的影响进行更多的实验研究，特别是对晶格变化和雪明碳钙重新分布的影响，这直接导致金属的韧性和变形性能下降，尤其是在零下气温条件下。研究了 10KhSND 和 D32 钢的使用寿命和零下温度对 a 矩阵晶格应力状态及其参数的影响。结果表明，长期使用后，这些钢材试样的晶格畸变应力值呈上升趋势，雪明碳酸盐的质量分数呈下降趋势。金相学研究表明，随着冷却介质温度的降低，氢化物的体积分数显著增加，从而导致钢的脆化和软化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.