High temperature behavior of Ni-base weld metal: Part II – Insight into the mechanism for ductility dip cracking
High temperature behavior of Ni-base weld metal: Part II – Insight into the mechanism for ductility dip cracking
复制标题
DOI：
10.1016/j.msea.2004.03.075
复制
发表时间：
2004-08
期刊：
影响因子：
6.4
通讯作者：
A. Ramirez;J. Lippold
中科院分区：
文献类型：
--
作者：
A. Ramirez;J. Lippold
采用应变断裂试验评价了两种镍基钎料52（59%Ni-29%Cr-9%Fe-1%Mn-1%Al）和82（72%Ni-20%Cr-1%Fe-3%Mn-3%Nb）的塑性浸渍裂纹敏感性。这些结果的分析和详细的焊缝金属显微组织表征（SEM和TEM）在第I部分中给出。这项工作的第二部分提供了新的见解蠕变样，晶界滑动机制，导致高温晶间裂纹在这些焊接存款。在当前高温蠕变理论的背景下，讨论了沉淀对晶界弯曲和滑动的影响，以及其对延性-浸渍抗开裂性的影响。最后，讨论了成分（包括析出相形成元素和杂质元素）对塑性浸渍裂纹的影响。
The ductility dip cracking susceptibility of two Ni-base filler metals, Filler Metal 52 (59%Ni–29%Cr–9%Fe–1%Mn–1%Al) and Filler Metal 82 (72%Ni–20%Cr–1%Fe–3%Mn–3%Nb) was evaluated using the strain-to-fracture test. The analysis of these results and detailed weld metal microstructural characterization (SEM and TEM) was presented in Part I. Part II of this work provides new insight into the creep-like, grain boundary sliding mechanism that leads to elevated temperature intergranular cracking in these weld deposits. The effect of precipitation on grain boundary tortuosity and sliding, and its influence on ductility-dip cracking resistance is discussed in the context of current theories of high temperature creep. Finally, the effect of composition, including both precipitate forming elements and impurity elements, on ductility-dip cracking is discussed.