摘要
对低碳低合金耐热钢12Cr1MoV在高温时效过程中,合金元素贫化以及从晶内向晶界扩散迁移、晶粒长大和脱溶沉淀的碳化物粒子粗化等成分、组织结构变化进行了研究,运用扩散理论、相变热力学和动力学理论对这些转变的规律进行分析和处理,并获得与实验相符合的结果.结果表明,合金元素的贫化和晶粒长大分别符合ΔC=K.t3/2和Dt=C.t1/2规律;通过Larson-Miller(P=T(C+lgt)热强参数的统一描述,指出了12Cr1MoV钢高温时效是持续而又缓慢的成分和组织结构逐渐变化(退化)的过程.
The dilution of alloy element,grain growth and carbide coarsening were studied for low-carbon-low alloy steel 12Cr1MoV during high temperature aging.Diffusion theory,phase transformation thermodynamics and kinetics were used for the analysis of the above transformation natures.And the consistency was obtained between the analysis result and the experimental result.The dilution of alloy element and grain growth of the tested material follow the relationships of ΔC=K·t^3/2 and D^—t=C·t^1/2 respectively.By means of the description of Larson-Miller parameter,P=T（C＋lgt）,it can be showed that the variation of chemical compositions and microstructures is progressive and very slow in the high temperature aging process for 12Cr1MoV.
出处
《材料科学与工艺》
CAS
CSCD
北大核心
2008年第1期19-22,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)
