摘要
T91／P91钢是我国发展超临界发电机组的主要候选钢种。对国产化T91／P91钢的深化研究表明：国产化T9llP91钢母材存在蠕变脆化倾向，焊接接头存在强度弱化和早期蠕变失效现象。研究证明：硫（S）是引起国产T91／P91钢晶界弱化和蠕变脆化的主要杂质元素；沪产T91钢中的铝（A1）和川产T91钢中的钛（Ti）等残余元素含量过高造成T91钢中弥散相NbV（C，N）分布不均匀和在钢中体积份额的减少。因此，沪产T91应严格控制A1含量；川产T91／P91应严格控制Ti含量。
?T91/P91 is main candidate steel in developing Chinese supercritical power generating unit.The deepened study of domestic T91/P91 indicates that creep embrittlement tendecy exists in base metal of domestic T91/P91 steel, and that strength weakening and early creep failure are found in welding oints. The research proves that sulfur (S) is main impurity element causing grain boundary weakening and creep embritt1ement of domestic steel T91/P91, and that the high content of residual elements such as aluminum (Al) in Shanghai made T9l and titanium (Ti) in Sichuan made T91 causes nonuniform distribution of diffused phase Nb, V(C,N) and reduction of volumetric ratio in steel. Therefore, content of Al and Ti shall be strictly controlled for Shanghai made T91 and Sicuan made T91/P91 respectively.
出处
《锅炉技术》
北大核心
1999年第8期16-25,32,共11页
Boiler Technology
关键词
耐热钢
焊接接头
蠕变脆化
晶界弱化
弥散强化
Heat-resistant steel Welding joint Creep embrittlement Grain boundary weakening Diffused fortification
