ISO 7539-6:2018由国际标准化组织 IX-ISO 发布于 2018-08-00。
ISO 7539-6:2018在国际标准分类中归属于: 77.060 金属的腐蚀。
This document specifies procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of precracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning notched specimens are given in Annex A. The term “metal” as used in this document includes alloys. Because of the need to confine plasticity at the crack tip, precracked specimens are not suitable for the evaluation of thin products, such as sheet or wire, and are generally used for thicker products including plate bar and forgings. They can also be used for parts joined by welding. Precracked specimens can be loaded with equipment for application of a constant load or can incorporate a device to produce a constant displacement at the loading points. Tests conducted under increasing displacement or increasing load are dealt with in ISO 7539-9. A particular advantage of precracked specimens is that they allow data to be acquired, from which critical defect sizes, above which stress corrosion cracking can occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined. The latter data can be taken into account when monitoring parts containing defects during service.
5、应力腐蚀试验根据加载方法的不同,可以分为恒应变法,恒载荷法和恒应速率法。在实际生中,由于冷热加工常常会产生残余应力主。焊接残余应力是最常见的一种,因此,焊接件也可用来作为应力腐蚀破裂试验髟试样。根据试验介质的不同,可以分为3.5%NaCl溶液交替沉浸法,沸腾MgCl2溶液法,连多硫酸法,高温高压试验法等。...
“钝化膜理论”或“膜破裂理论”表明在应力或活性离子的作用下腐蚀破坏时,首先表现为钝化膜的破坏。破坏部分成为阳极;裂纹尖端应力集中降低阳极电位,加速阳极溶解。在应力作用下表面钝化膜破坏是由于临近裂纹尖端处容易产生局部塑性变形而形成滑移台阶所致,如图 2 所示。“阳极溶解理论”认为阳极金属的不断溶解导致应力腐蚀 SCC 裂纹的形核和扩展,造成合金结构的断裂。...
GB/T 14849.9-2015 工业硅化学分析方法 第9部分:钛含量的测定 二安替吡啉甲烷分光光度法 GB/T 15487-2015 容积式压缩机流量测量方法 GB/T 16545-2015 金属和合金的腐蚀 腐蚀试样上腐蚀产物的清除 GB/T 16936-2015 土方机械 发动机净功率试验规范 GB/T 18148-2015 土方机械 压实机械压实性能试验方法 GB/T 18256-2015...
Testing with Surface-Crack Tension SpecimensE812-91(1997) 高强度金属材料制慢弯预裂落摆冲击试样的破裂强度的测试方法 Standard Test Method for Crack Strength of Slow-Bend Precracked Charpy Specimens of High-Strength Metallic...
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