CAJ | 학술논문

回火对核电设备用A508-3钢的力学性能影响很大。采用扫描电镜和硬度测试研究了A508-3钢回火过程中组织的演变和性能的变化，并对经600～660℃回火的钢进行了基于硬度测量的动力学分析。回火过程中硬度的变化可以用残留奥氏体和奥氏体马氏体的分解，贝氏体铁素体内碳化物的析出、粗化以及贝氏体铁素体的回复再结晶来解释。动力学分析表明，A508-3钢在600～660℃回火时的相变激活能约为101．4 kJ/mol，与碳原子在铁素体中的扩散激活能相近。 A508-3钢只有在较高温度回火时，才出现贝氏体铁素体内碳化物的大量析出和粗化，这说明该钢种具有较好的回火稳定性。
회화대핵전설비용A508-3강적역학성능영향흔대。채용소묘전경화경도측시연구료A508-3강회화과정중조직적연변화성능적변화，병대경600～660℃회화적강진행료기우경도측량적동역학분석。회화과정중경도적변화가이용잔류오씨체화오씨체마씨체적분해，패씨체철소체내탄화물적석출、조화이급패씨체철소체적회복재결정래해석。동역학분석표명，A508-3강재600～660℃회화시적상변격활능약위101．4 kJ/mol，여탄원자재철소체중적확산격활능상근。 A508-3강지유재교고온도회화시，재출현패씨체철소체내탄화물적대량석출화조화，저설명해강충구유교호적회화은정성。
The tempering sequence will have significant influence on mechanical properties of A 508-3 steel for use with nuclear power equipment .The microstructure evolution and property change of A 508-3 steel during tempering was investigated by SEM and hardness test , and kinetic analysis based on hardness test was performed for the steel tempered at 600 to 660 ℃.The hardness change of the steel during tempering will arise from decompositions of retained austenite and martensite-austensite ( M-A) , precipitation and coarsening of carbides inside bainitic ferrite , and recrystallization of bainitic ferrite .The kinetic analysis shows that the transformation activation energy of A 508-3 steel during tempering at 600 to 660 ℃is about 101.4 kJ/mol which is close to the value of diffusion activation energy of carbon atom in ferrite .In addition , the considerable precipitation and coarsening of carbides inside the bainitic ferrite occur only in A508-3 steel tempered at higher temperatures , which indicates that the tempering resistance of A508-3 steel is excellent .