Carbide Precipitation and Corrosion Resistance in HAZ of 15Cr-75Ni Alloy

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI:10.2207/QJJWS.6.530

K. Ogawa, M. Miura, T. Minami

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引用次数: 1

Abstract

Carbide precipitation in niclel based alloy takes place at elevated temperature. The tendency of this phenomenon is stronger than in austenitic stainless steel. But the carbide precipitation in HAZ of nickel based alloy has not been investigated enough as that of austenitic stainless steel.The effect of weld thermal cycle on carbide precipiration of 15Cr-75Ni alloy (UNS N06600) and its relation with intergranular corrosion in nitric acid were investigated. And prevention of sensitization in HAZ was investigated from the view point of chemical composition.The susceptibility to intergarnular corrosion in HAZ agreed with the carbide behavior during weld thermal cycle and aging so far as the aging heat treatment condition of this work. The carbide in the base metal overaged is solid soluted and nucleates at the grain boundary by weld thermal cycle, and the carbide precipitated and grew during aging. The chrominm depleted zone has not healed after aged for 15 hours at 823K, so the carbide caused the intergranular sensitization.The sensitization in HAZ of 15Cr-75Ni Alloy can be prevented by the suitable addition of Nb; Nb/ C<40 in weight ratio.

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15Cr-75Ni合金热影响区碳化物析出及耐蚀性

镍基合金中的碳化物在高温下析出。这种现象的倾向比在奥氏体不锈钢中更强烈。但对镍基合金热影响区碳化物析出的研究还不像奥氏体不锈钢那样深入。研究了焊接热循环对15Cr-75Ni合金(UNS N06600)碳化物析出的影响及其与硝酸晶间腐蚀的关系。并从化学成分的角度探讨了热影响区致敏的预防措施。热影响区对晶间腐蚀的敏感性与本工作时效热处理条件下焊缝热循环和时效过程中碳化物的行为一致。焊缝热循环时效后，基体中的碳化物在晶界处固溶成核，碳化物在时效过程中析出长大。823K时效15小时后，贫铬区仍未愈合，碳化物引起了晶间敏化。适当添加Nb可防止15Cr-75Ni合金热影响区敏化;重量比Nb/ C<40。

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Transactions of the Japan Welding Society

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