海洋工程用高强钢断裂韧性与断口微观参数关系研究

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中图分类号：TB9;O34文献标志码：A

文章编号：1674-5124（2026）02-0007-06

Study on the relationship between fracture toughness and fracture surface microstructural parameters of high-strength steel for offshore engineering

XUE Chunyang1， YANG Mengmeng²， WANG Lianqingl， REN Xuechong² （1. State Key Laboratory for Advanced Metals & Materials，UniversityofScience and Technology Beijing，Beijing 100083， China; 2. National Center for Materials Service Safety， University of Science and Technology Beijing， Beijing ， China）

Abstract： With the development of deep-sea mining， the low-temperature fracture properties of steel used in marine engineering is receiving increasing atention. This article takes EH47 marine engineering steel as an example to study the variation law of its fracture toughness at various temperatures，and analyzes the relationship between its low-temperature fracture toughness and microscopic parameters of fracture surface. The results indicate that the fracture toughness decreases in decreasing temperature in the ductile britle transition range. The average fracture toughness decreases from 742μm to 87μm .Through observation of the fracture surface，it was found that within the ductile britle transition temperature range，the microscopic parameters of fracture surface， plastic crack propagation distance dfib and cleavage initiation distance yf， gradually decrease with decreasing temperature.The mathematical relationship between fracture toughness and microscopic parameters of fracture surface was clarified through data fiting， with a correlation coefficient r2⩾ 0.89.This study provides certain data and theoretical support for the evaluation and use of fracture properties of steel for ocean engineering in actual service environments.

Keywords： steel for marine engineering； fracture properties;； plastic crack propagation distance; cleavage initiation distance

0 引言

党的十九大报告明确提出要“加快建设海洋强国”，而发展海洋工程装备是建设海洋强国的关键一环。（剩余7244字）