Evaluation of solidification cracking susceptibility factors in carbon steel and availability of Ti addition based on theoretical analysis

Q4 Materials Science

Welding International Pub Date : 2023-07-06 DOI:10.1080/09507116.2023.2230658

N. Sahara, Shotaro Yamashita, K. Ono, K. Saida

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引用次数: 0

Abstract

Abstract This study conducted a basic investigation to improve the solidification cracking susceptibility of carbon steel. BTR is one of the susceptibilities to solidification cracking, and it is said that solidification cracking susceptibility is reduced when BTR is smaller. BTR of three commercial filler metals was evaluated by using Trans-Varestraint test. EPMA and EDS analysis of the weld metal microstructure revealed two compounds. The white structure was composed of silicon, manganese, and sulphur, and the black structure was Ti-based compound. Theoretical analysis of BTR was conducted by applying a two-phase peritectic solidification model in FA mode and considering MnS crystallization during solidification segregation. The analysis results indicated that BTR of carbon steel is attributed to the difference in solidification completion temperatures, and carbon is the most deleterious element. Also, MX compound (Ti, C, N) crystallized in addition to MnS at the end of solidification. Theoretical analysis was conducted for Ti virtual addition materials because MX compound (Ti, C, N) crystallization by Ti addition may lead to BTR reduction by trapping C in the liquid phase. The results showed that Ti addition reduced BTR. The amount of C in the residual liquid phase was reduced by an increase in MX compound (Ti, C, N) crystallization due to Ti addition. Based on theoretical considerations, it can be concluded that Ti addition to carbon steel is effective in reducing BTR.

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基于理论分析的碳钢凝固开裂易损性因素评估及钛添加量的可用性

摘要本研究对改善碳钢凝固裂纹敏感性进行了基础调查。BTR是凝固开裂的敏感性之一，BTR越小，凝固开裂的敏感性越低。我们使用 Trans-Varestraint 试验评估了三种商用填充金属的 BTR。对焊缝金属微观结构的 EPMA 和 EDS 分析显示出两种化合物。白色结构由硅、锰和硫组成，黑色结构为钛基化合物。通过应用 FA 模式下的两相包晶凝固模型，并考虑凝固偏析过程中的 MnS 结晶，对 BTR 进行了理论分析。分析结果表明，碳钢的 BTR 归因于凝固完成温度的差异，而碳是最有害的元素。此外，在凝固末期，除 MnS 外，还有 MX 化合物（Ti、C、N）结晶。对 Ti 虚拟添加材料进行了理论分析，因为通过添加 Ti 而结晶的 MX 化合物（Ti、C、N）可能会在液相中捕获 C，从而导致 BTR 降低。结果表明，Ti 的添加降低了 BTR。由于添加了钛，MX 化合物（Ti、C、N）结晶增加，残留液相中的 C 量减少。基于理论考虑，可以得出结论：在碳钢中添加 Ti 能有效降低 BTR。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.