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首页> 外文会议>6th International Conference on Trends in Welding Research Apr 15-19, 2002 Phoenix, Arizona USA >Quantifying Ductility-Dip Cracking Susceptibility in Nickel-Base Weld Metals using the Strain-to-Fracture Test
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Quantifying Ductility-Dip Cracking Susceptibility in Nickel-Base Weld Metals using the Strain-to-Fracture Test

机译：使用应变至断裂试验量化镍基焊接金属的延展性-浸裂敏感性

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摘要

Ductility-dip cracking (DDC) is a solid-state, elevated temperature cracking phenomenon that has been observed in multi-pass, thick section austenitic stainless steel and nickel-base alloy weld metals where large grain size and high restraint are characteristic. Single-phase weld metals with low impurity contents, grain boundary precipitates and/or second phases may have a higher susceptibility to DDC as these weld metals have little resistance to grain boundary movement. Although DDC is a fairly uncommon phenomenon, in applications where there is low defect tolerance, its occurrence can be very costly. In recent years, Alloy 690 base material and Filler Metals 52 and 82 have become the materials of choice for commercial nuclear steam generator applications. The Transverse and "Double-Spot" Varestraint test methods have shown these materials to be susceptible to DDC. In addition to the aforementioned DDC test methods, a Gleeble-based test technique, termed "Strain-to-Fracture" (STF), has recently been developed by Nissley and Lippold and was employed in this particular investigation to develop and evaluate STF DDC susceptibility curves for Filler Metals 52 and 82. Graphical results from this test technique will be presented, including metallographic characterization of DDC test specimens. Additionally, DDC susceptibility effects of weld metal interstitial additions will be summarized.
机译：延展性开裂（DDC）是一种固态，高温开裂现象，在具有大晶粒度和高约束力的多道次厚截面奥氏体不锈钢和镍基合金焊接金属中已经观察到。具有低杂质含量，晶界析出物和/或第二相的单相焊接金属可能对DDC的敏感性更高，因为这些焊接金属对晶界运动的抵抗力很小。尽管DDC是相当不常见的现象，但在缺陷容忍度较低的应用中，其发生的代价可能非常高。近年来，690合金基础材料和填充金属52和82已成为商业核蒸汽发生器应用的首选材料。横向和“双点”压变测试方法表明这些材料易受DDC影响。除上述DDC测试方法外，Nissley和Lippold最近还开发了一种基于Gleeble的测试技术，称为“应变至断裂”（STF），并已用于该特定研究中，以开发和评估STF DDC的敏感性。填充金属52和82的曲线。将显示此测试技术的图形结果，包括DDC测试样品的金相表征。此外，将总结焊接金属间隙添加物对DDC的敏感性。

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