TEM characterization on new 9% Cr advanced steels thermomechanical treated after tempering
TEM characterization on new 9% Cr advanced steels thermomechanical treated after tempering
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DOI：
10.1016/j.jnucmat.2017.12.025
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发表时间：
2018-03
影响因子：
3.1
通讯作者：
P. Fernández;J. Hoffmann;M. Rieth;M. Roldán;A. Gómez-Herrero
中科院分区：
文献类型：
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作者：
P. Fernández;J. Hoffmann;M. Rieth;M. Roldán;A. Gómez-Herrero
研究了新型六种低活化铁素体/马氏体钢(RAFM)的相变，为设计和开发具有足够强度和5 0 0 °C以上蠕变抗力的先进钢提供了依据。新合金旨在通过细化合金成分和采用形变处理来增加细小MX析出物的数量，减少粗大M23C6碳化物的数量。金相组织分析表明，在70 0 °C/2 h回火条件下，马氏体析出M2 3C6、M2X和MX相，位错恢复率较低；而在82 5 °C/2 h回火条件下，马氏体析出亚晶。在这一阶段，只检测到M23C6和MX。初步结果表明，通过进一步优化回火处理工艺，可以生产出弥散分布在基体中的细小MX强化颗粒。
Phase transformation on new six reduced activation ferritic/martensitic steels (RAFMs) was investigated to provide the basis for the design and development of advanced steels to maintain adequate strength and creep resistance above 500 °C. The new alloys are designed to increase the amount of fine MX precipitates and reduce coarse M23C6carbides through alloy composition refinement and the application of thermomechanical treatments. The microstructural investigations by TEM have shown M23C6, M2X, and MX precipitation after tempering at 700 °C/2h with low dislocation recovery, while at 825 °C/2h the martensite developed to subgrain formation and growth. At this stage, only M23C6and MX were detected. Preliminary results demonstrate that it is feasible to produce fine MX strengthened particles dispersed in the matrix with further optimization of tempering treatments.