CAJ | 학술논문

对X100焊管的母材和焊接接头微观组织及其与力学性能之间的关系进行了研究。结果表明，母材的组织为粒状贝氏体和针状铁素体，且针状铁素体含量较多时，强韧匹配较好，有较好的低温冲击韧性；焊缝组织为针状铁素体和先共析铁素体，不同组织焊缝性能相差不大；热影响区粗晶区组织为粒状贝氏体，细小弥散的马奥岛有利于热影响区粗晶区获得跟好的强度和韧性，但是较多的马奥岛会提高热影响区的韧脆转变温度。
대X100한관적모재화한접접두미관조직급기여역학성능지간적관계진행료연구。결과표명，모재적조직위립상패씨체화침상철소체，차침상철소체함량교다시，강인필배교호，유교호적저온충격인성；한봉조직위침상철소체화선공석철소체，불동조직한봉성능상차불대；열영향구조정구조직위립상패씨체，세소미산적마오도유리우열영향구조정구획득근호적강도화인성，단시교다적마오도회제고열영향구적인취전변온도。
In this article, the relationship between the microstructure and mechanical properties of base metal and welding joint of X100 welded pipes were studied. The result showed that the microstructure of base metal consists of granular bainite and acicular ferrite, the more acicular ferrite, the better strength-toughness matching and toughness at low temperature. The microstructure of weld is acicular ferrite and the proeutectoid ferrite, and the difference of different weld microstructure is small. The microstructure of HAZ coarse grain zone is granular bainite. The fine and dispersive M/A island is favorable for obtaining better strength and toughness, but more M/A island can increase the ductile-brittle transition temperature of HAZ.