摘要
采用了11种实验室模拟工艺（650～750℃、1．5～873h），利用TEM、SEM、OM等考察了珠光体耐热钢12Cr1MoV高温长时间加热后成分、组织结构与性能的变化．研究表明，试验用钢在高温时效后其组织结构明显退化，固溶体内合金元素Cr、Mo、V严重贫化（其中Mo的降幅为2／3），发生晶粒长大（～70％），碳化物向晶界的聚集粗化，以及相变位错密度显著降低和位错胞尺寸变大及消散等，同时基体硬度下降30％．多层次结构综合分析表明，12Cr1MoV耐热钢高温时效中，由于组织结构的退化，引起其性能的劣化，导致材料的弱化（老化）．
The variation of compositions, microstructures and properties of pearlitic heat resistant steal 12 Crl MoV after elevated temperature-long term heating, with eleven kinds of experimental simulation proces- ses（650 ～ 750℃ and 1.5 ～ 873 h） , has been examined by means of TEM, SEM and OM, etc.. It is concluded that, after high-temperature aging, the microstructure of the tested material degrades obviously, the alloy elements （Mo,Cr,V） in solid solution are diluted deeply （ variation of Mo, about 2/3 ） , its grains grow considerably（ ~ 70% ） , carbides coarsen and aggregate toward grain boundaries, the density of phase transformation dislocation reduces greatly and size of dislocation cells increases then disappears progressive- ly. Meanwhile, the hardness of the tested material matix reduces（about 30% ）. The analysis shows that, during high temperature aging, the material weakening of the tested heat-resistant steel 12CrMoV is contributed to its microstructure degeneration which causes its mechanical property to deteriorate.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第2期221-224,共4页
Materials Science and Technology
基金
甘肃省自然科学基金资助项目(ZS001-A22-046-C)
关键词
耐热钢
珠光体
时效
退化
heat resistant steel
pearlite
aging
degeneration
