CAJ | 학술논문

利用光学显微镜、扫描电子显微镜、能谱仪、X 射线衍射仪和冲击试验机等研究了 F12钢焊接接头高温运行16．5万h后的显微组织和冲击韧性.结果表明：高温运行16．5万 h 后,F12钢焊接接头中的马氏体发生分解,接头中的析出相主要为M23 C6型碳化物,其在晶界析出并聚集长大,呈孤立的颗粒状或链状分布；F12钢焊接接头出现显著的时效脆化现象,这与组织中 M23 C6相的析出、聚集长大有关；母材冲击断口为沿晶断裂,焊缝金属的为解理断裂.
이용광학현미경、소묘전자현미경、능보의、X 사선연사의화충격시험궤등연구료 F12강한접접두고온운행16．5만h후적현미조직화충격인성.결과표명：고온운행16．5만 h 후,F12강한접접두중적마씨체발생분해,접두중적석출상주요위M23 C6형탄화물,기재정계석출병취집장대,정고립적과립상혹련상분포；F12강한접접두출현현저적시효취화현상,저여조직중 M23 C6상적석출、취집장대유관；모재충격단구위연정단렬,한봉금속적위해리단렬.
Microstructure and impact toughness of F12 steel welded joint after service at high temperature for 165 000 h was studied by optical microscopy,scanning electron microscopy,energy dispersive spectroscopy,X-ray scattering technique and impact testing.Results show that after service at high temperature for 165 000 h, martensite in the welded joint of F12 steel decomposed,and precipitation phases in the welded joint mainly were M23 C6 carbide,and they precipitated at the grain boundaries,and then gathered and grew with isolated granule or chain-like distribution.The welded joint exhibited obvious aging brittleness,this attribured to gathering and growing of M23 C6 phase.The base metal in the joint was intergranular fracture morphology,and the weld metal was cleavage fracture morphology.