Development of Advanced 12Cr Steel Rotor Forgings
Development of Advanced 12Cr Steel Rotor Forgings
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先进12Cr钢转子锻件的研制
DOI：
10.2355/tetsutohagane1955.76.7_1084
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发表时间：
1990
影响因子：
0.3
通讯作者：
Miyazaki Matsuo
中科院分区：
文献类型：
--
作者：
Masayuki Yamada;O. Watanabe;Youmei Yoshioka;Miyazaki Matsuo
简介：采用不同W（0 ~ 1.24wt%）、Ni（0.40 ~ 1.35wt%）和C（0.12 ~ 0.19wt%）含量的试样，研究了W、Ni和C含量对12 Cr-Mo-V-Nb-N钢转子锻件拉伸性能、韧性、持久强度和显微组织的影响。结果总结如下。(1)在低C、高Ni含量的条件下，加入约1%的W，可在不降低韧性的情况下显著提高合金的持久强度。(2)先进12 Cr钢蠕变断裂强度的提高主要是由于W的固溶强化抑制了蠕变变形过程中位错回复和亚晶组织的形成。(3)在上述基础研究工作的基础上，试制了转子锻件，证明该锻件具有较高的蠕变断裂强度，满足涡轮机转子锻件的力学性能和质量要求。(4)另外，在涡轮机叶片和机匣材料中，通过改变与转子材料相似的化学成分，证明蠕变断裂强度显著提高。通过以上研究和开发，获得的先进12 Cr钢有望应用于未来593·MW超超临界涡轮机的转子、叶片和机匣。
Synopsis : Effects of W addition, Ni and C contents on tensile properties, toughness, creep rupture strength and microstructure in 12Cr-Mo-V-Nb-N steel rotor forging were investigated, using specimens with various amounts of W(0 to 1.24wt%), Ni(0.40 to 1.35wt%) and C(0.12 to 0.19wt%). The results are summarized as follows. (1) Creep rupture strength was remarkably improved without the decreasing of toughness, by the addition of about 1%W with lower C and higher Ni contents. (2) The improvement of creep rupture strength in advanced 12Cr steel is mainly caused by the depression of dislocation recovery and the formation of sub-grain structure during creep deformation brought from solid-solution strengthening by W addition. (3) Trial rotor forging was manufactured based on the above basic research work, and it was proved that this forging had improved creep rupture strength and was satisfied enough with the mechanical properties and quality as a turbine rotor forging. (4) Also in the turbine blade and casing materials, it was proved that the creep rupture strength was remarkably improved by modifying the chemical composition similar to rotor material. It is expected that the advanced 12Cr steels obtained from the above R&D are applied for rotor, blade and casing in the future 593•Ž ultra-super critical turbine unit.