The effects of chemistry variations on hot cracking susceptibility of Haynes 282 for aerospace applications
The effects of chemistry variations on hot cracking susceptibility of Haynes 282 for aerospace applications
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化学变化对航空航天应用 Haynes 282 热裂纹敏感性的影响
DOI：
10.1016/j.matdes.2023.111853
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发表时间：
2023
影响因子：
8.4
通讯作者：
Joel Andersson
中科院分区：
文献类型：
--
作者：
Sukhdeep Singh;Kota Kadoi;Olanrewaju Ojo;Boian Alexandrov;Joel Andersson
研究了不同含量的 C (0.05–0.09 wt%)、Mn (0.03–0.12 wt%)、Si (0.03–0.16)、B (0.005–0.006 wt%) 和 Zr (0–0.01) 的 Haynes® 282® 的热裂敏感性。 C 和 B 对凝固和热影响区 (HAZ) 液化裂纹敏感性具有协同作用。高含量的C和B促进凝固最后阶段共晶成分的形成，并通过回填效应促进裂纹愈合。当C和B添加量较低时，由于不存在共晶成分，裂纹愈合不会发生，因此裂纹程度增加。热力学模拟表明，C 和 B 在凝固过程中与 MC 碳化物和 M3B2 硼化物结合。扫描电子显微镜和纳米级二次离子质谱分析表明，C 和 B 分别以固溶体和沉淀形式存在于富 Ti-Mo 碳化物和富 Mo 硼化物中。在热影响区中，这些相促进液化裂纹，其中裂纹程度与碳化物和硼化物的量相关。研究发现较低的 C 和 B 可以减少热影响区的液化裂纹。此外，1190°C 的高温均匀化热处理通过溶解硼化物并将 B 释放到晶界来加剧裂纹。
Hot cracking susceptibility of Haynes® 282®with varying amount of C (0.05–0.09 wt%), Mn (0.03–0.12 wt%), Si (0.03–0.16), B (0.005–0.006 wt%) and Zr (0–0.01) are investigated. Synergistic role of C and B is found on solidification and heat affected zone (HAZ) liquation cracking susceptibility. High amount of C and B promote formation of eutectic constituents during final stages of solidification and promote crack healing by backfilling effect. When C and B are added in low amount the crack healing does not occur due to the absence of eutectic consituents therefore cracking extent increases. Thermodynamics simulations indicate C and B tie up to MC carbides and M3B2borides during solidification. Scanning Electron Microscopy and Nanoscale secondary ion mass spectrometry analysis reveal C and B to be present both in solid solution and in form of precipitates to Ti-Mo rich carbides and Mo rich borides, respectively. In HAZ, these phases promote liquation cracking where cracking extent correlates to the amount carbides and borides. Lower C and B is found to reduce the liquation cracking in the HAZ. Furthermore, a high temperature homogenization heat treatment at 1190 °C excarbates the cracking by dissolving the borides and releasing B to the grain boundaries.