ISO 7539-9:2003 金属和合金腐蚀-胁强腐蚀试验-第9部分：增长负荷或增长位移下预破裂样品制备和使用

标准编号：ISO 7539-9:2003

中文名称：金属和合金腐蚀-胁强腐蚀试验-第9部分：增长负荷或增长位移下预破裂样品制备和使用

英文名称：Corrosion of metals and alloys — Stress corrosion testing — Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement

发布日期：2003-04

标准范围

ISO 7539-9:2003涵盖了设计、制备和使用预裂试样的程序，用于通过在上升荷载或上升位移下进行的试验来调查金属对应力腐蚀开裂的敏感性。“金属”一词包括合金。由于需要将塑性限制在裂纹尖端，预裂纹试样不适合评估薄产品，如板材或线材，通常用于较厚的产品，包括板材、棒材和锻件。它们也可用于通过焊接连接的零件。预裂纹试样的一个特殊优点是，它们允许获取数据，从中可以估计出承受已知应力的已知几何形状部件的临界缺陷尺寸，超过该尺寸可能会发生应力腐蚀开裂。它们还可以确定应力腐蚀裂纹扩展速率。该试验的一个主要优点是，它考虑了动态应变对应力腐蚀开裂阈值的潜在影响。

ISO 7539-9:2003 covers procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking by means of tests conducted under rising load or rising displacement. The term "metal" includes alloys.Because of the need to confine plasticity to the crack tip, pre-cracked 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.A particular advantage of pre-cracked specimens is that they allow data to be acquired from which critical defect sizes, above which stress corrosion cracking may 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.A principal advantage of the test is that it takes into account the potential impact of dynamic straining on the threshold for stress corrosion cracking.

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