ISO 7539-6:2018由國際標準化組織 IX-ISO 發布于 2018-08-00。
ISO 7539-6:2018在國際標準分類中歸屬于: 77.060 金屬的腐蝕。
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、應力腐蝕試驗根據加載方法的不同,可以分為恒應變法,恒載荷法和恒應速率法。在實際生中,由于冷熱加工常常會產生殘余應力主。焊接殘余應力是最常見的一種,因此,焊接件也可用來作為應力腐蝕破裂試驗髟試樣。根據試驗介質的不同,可以分為3.5%NaCl溶液交替沉浸法,沸騰MgCl2溶液法,連多硫酸法,高溫高壓試驗法等。...
“鈍化膜理論”或“膜破裂理論”表明在應力或活性離子的作用下腐蝕破壞時,首先表現為鈍化膜的破壞。破壞部分成為陽極;裂紋尖端應力集中降低陽極電位,加速陽極溶解。在應力作用下表面鈍化膜破壞是由于臨近裂紋尖端處容易產生局部塑性變形而形成滑移臺階所致,如圖 2 所示。“陽極溶解理論”認為陽極金屬的不斷溶解導致應力腐蝕 SCC 裂紋的形核和擴展,造成合金結構的斷裂。...
GB/T 14849.9-2015 工業硅化學分析方法 第9部分:鈦含量的測定 二安替吡啉甲烷分光光度法?GB/T 15487-2015 容積式壓縮機流量測量方法?GB/T 16545-2015 金屬和合金的腐蝕 腐蝕試樣上腐蝕產物的清除?GB/T 16936-2015 土方機械 發動機凈功率試驗規范?GB/T 18148-2015 土方機械 壓實機械壓實性能試驗方法?GB/T 18256-2015...
Testing with Surface-Crack Tension SpecimensE812-91(1997)????高強度金屬材料制慢彎預裂落擺沖擊試樣的破裂強度的測試方法????Standard Test Method for Crack Strength of Slow-Bend Precracked Charpy Specimens of High-Strength Metallic...
Copyright ?2007-2022 ANTPEDIA, All Rights Reserved
京ICP備07018254號 京公網安備1101085018 電信與信息服務業務經營許可證:京ICP證110310號