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首页> 外文期刊>Journal of Failure Analysis and Prevention >An Environmentally Assisted Cracking Evaluation of UNS C64200 (Al-Si-Bronze) and UNS C63200 (Ni-Al-Bronze)
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An Environmentally Assisted Cracking Evaluation of UNS C64200 (Al-Si-Bronze) and UNS C63200 (Ni-Al-Bronze)

机译：UNS C64200（铝硅青铜）和UNS C63200（镍铝青铜）的环境辅助开裂评估

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摘要

A recent failure of a union nut, UNS C64200, made of Al-Si-Bronze (ASB) in a breathing air system of a marine platform has highlighted the need for environmentally assisted cracking (EAC) data for both ASB and Ni-Al-Bronze UNS C63200 (NAB) components in environments relevant to marine use. In addition, the possibility of exposure to ammonia environments via cleaning agents or biological processes warrants consideration because of the known susceptibility of bronze to EAC in ammonia environments. A displacement-controlled, rising step load (RSL) technique was employed on precracked compact tension specimens to quantify and compare the threshold stress intensities for EAC in air, seawater (SW), and SW + ammonia environments for wrought ASB and NAB materials. These results are compared to calculations of the stress intensity in service to determine the probability of EAC initiation. ASB was found to be susceptible to subcritical intergranular EAC initiation in laboratory air, SW, and SW + ammonia environments. NAB was immune to EAC under the conditions tested in laboratory air and SW, but was susceptible to intergranular EAC in SW + ammonia solution. The threshold stress intensity in SW + ammonia was found to be similar for both ASB and NAB; however, the subcritical crack growth rate for NAB was found to be 2-3 times faster than ASB. Calculations of stress intensity indicate that, in the air system applications where the installation torques are higher, the likelihood of subcritical cracking in ammonia environments is high. Stress intensities approach the ASB threshold values for subcritical intergranular cracking in air when the defect depth approaches half the wall thickness of the nut.
机译：由铝硅青铜（ASB）制成的活接螺母UNS C64200最近在海上平台的呼吸空气系统中发生故障，这凸显了对于ASB和Ni-Al-Al的环境辅助开裂（EAC）数据的需求与海洋使用相关的环境中的铜制UNS C63200（NAB）组件。另外，由于已知铜在氨环境中对EAC的敏感性，因此需要考虑通过清洁剂或生物方法暴露于氨环境的可能性。在预破裂的致密拉伸试样上采用位移控制的上升阶梯载荷（RSL）技术，以量化和比较空气，海水（SW）和SW +氨环境中EAC变形的ASB和NAB材料的阈值应力强度。将这些结果与服务中应力强度的计算结果进行比较，以确定EAC启动的可能性。发现ASB在实验室空气，SW和SW +氨环境中易受亚临界晶间EAC引发。在实验室空气和西南空气中测试的条件下，NAB对EAC免疫，但在西南+氨溶液中对粒间EAC敏感。对于ASB和NAB，SW +氨中的阈值应力强度相似。然而，发现NAB的亚临界裂纹生长速率比ASB快2-3倍。应力强度的计算表明，在安装扭矩较高的空气系统应用中，氨环境中亚临界裂纹的可能性较高。当缺陷深度接近螺母壁厚的一半时，应力强度接近空气中亚临界晶间裂纹的ASB阈值。

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