在高压纯环境下,X70管的脆性敏感度
Kangxin Shuai1,2, Haixiao Liu3, Ming Li3
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650031, China.
Materials (Basel, Switzerland)
|December 17, 2024
概括
高压显著降低X70管的柔性和疲劳寿命,接金属更容易受到影响. 微观结构的差异解释了基础金属和接金属之间的不同脆度.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 腐蚀科学 腐蚀科学
背景情况:
- 越来越多的气管道基础设施需要了解在高压气下材料的行为.
- 气脆弱性对管道完整性构成重大安全风险.
- X70管道钢是运输的关键材料,需要进行彻底的安全评估.
研究的目的:
- 为了评估X70管在10MPa气环境中的脆度.
- 在暴露下比较普通金属 (BM) 和金属 (WM) 的机械性能和断裂行为.
- 为了阐明影响X70管道钢中的脆性的微结构因素.
主要方法:
- 使用了缓慢应变速率测试 (SSRT) 和低周期疲劳 (LCF) 分析.
- 使用超深度显微镜,SEM,EBSD和TEM进行微结构性表征.
- 分析了拉伸和疲劳骨折的形态.
主要成果:
- 高压极少影响最终拉伸强度,但显著减少面积和延伸,接金属显示较大的减少.
- 断裂模式从柔性转变为柔性 + 在下准裂变,微裂变增加.
- 疲劳寿命在气中减少,在接金属中更为如此,表现出准裂纹断裂模式.
结论:
- 接金属表现出更高的脆性敏感性,这是由于更大的M / A成分和入.
- 基本金属的纳米尺寸Nb,V,Ti复合碳化物作为有效的陷,降低易碎的灵敏度.
- 了解微结构效应对于减轻X70管道钢中的脆性至关重要.
相关概念视频
Bending of Material: Problem Solving
172
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
172
Mechanical Characteristics of Steel
393
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
393
Yield Criteria for Ductile Materials under Plane Stress
147
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
147
Multiple Pipe Systems
415
Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
415
Residual Stresses
206
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
206


