摘要
通过对超/超超临界火电机组用C12A耐热钢正火后进行不同回火温度的处理，研究了回火温度对其组织和性能的影响。结果表明，C12A材质在铸态下由板条马氏体和少量铁素体组成，经过正火加高温回火处理后，马氏体板条发生多边化回复，板条间分布弥散析出的碳氮化物，随回火温度的升高，马氏体形态和析出物的分布出现明显的变化。在730～810 ℃范围强度随回火温度升高而下降，回火温度继续升高，强度开始回升，伸长率则呈现相反的趋势。回火温度在750～770 ℃范围内，材料在保持强度适中的同时，得到较高的塑性和伸长率，具有较好的综合性能。
In this paper, the effect of tempering temperature on microstructure and properties of C12A heat-resistant steel was studied. The results show that the microstructure of as-cast C12A comprises lath-type martensite and a small amount of ferrite, however, the morphology lath-type martensite changed to polygon, among which there exist some carbonitride after normalizing and tempering. With higher tempering temperature, obvious changes of martensite morphology and precipitation distribution take place. As a result, at the range of 730-810 ℃, the tensile strength decrease with the tempering temperature increase, but increase when above 810 ℃, while the elongation has the opposite results. When tempering at the range of 750-770 ℃, this kind of material has good comprehensive properties.
出处
《铸造》
CAS
CSCD
北大核心
2013年第8期777-780,共4页
Foundry
关键词
C12A钢
热处理
强度
伸长率
C12 steel
heat treatment
strength
elongation
