铁道建筑
鐵道建築
철도건축
Railway Engineering
2015年
11期
14-17
,共4页
Q500qE高性能桥梁钢%断裂韧性( CTOD)%结果评定%试验研究
Q500qE高性能橋樑鋼%斷裂韌性( CTOD)%結果評定%試驗研究
Q500qE고성능교량강%단렬인성( CTOD)%결과평정%시험연구
Q500qE high-performance bridge steel%The fracture toughness( CTOD)%Evaluation%Experimental study
针对不同厚度规格的Q500 qE高性能桥梁钢母材和焊接接头，在不同温度条件下进行了断裂韧性CTOD试验，旨在系统研究 Q500qE高性能桥梁钢母材及其焊接接头的断裂抗力随温度的变化规律。试验结果表明：随着温度的降低，32和44 mm 板厚 Q500qE 母材的断裂韧性变化不大，但60 mm 板厚Q500 qE母材的断裂韧性在温度降至－40℃以下后，有较大幅度的降低；各种板厚的 Q500 qE 焊缝的断裂韧性都比母材低；随着温度的下降，Q500qE 焊缝的断裂韧性大幅降低，特别是44和60 mm 板厚Q500 qE焊缝。说明 Q500 qE焊缝的抗断性能，尤其是低温抗断性能比母材要差很多。评定结果表明：除60 mm板厚 Q500qE母材－50℃时的CTOD值外，其它各种板厚 Q500qE 母材的 CTOD 值均在失效评定曲线 FAD图的可接受区域内，其断裂韧性值是合格的；32，44，60 mm 板厚的 Q500qE 焊缝，仅有常温及32 mm板厚在－20℃的断裂韧性是合格的，与母材相比，Q500qE 焊缝的低温抗断性能较差。所以，对于 Q500 qE高性能桥梁钢需要进一步加强对焊缝性能的改善研究。
針對不同厚度規格的Q500 qE高性能橋樑鋼母材和銲接接頭，在不同溫度條件下進行瞭斷裂韌性CTOD試驗，旨在繫統研究 Q500qE高性能橋樑鋼母材及其銲接接頭的斷裂抗力隨溫度的變化規律。試驗結果錶明：隨著溫度的降低，32和44 mm 闆厚 Q500qE 母材的斷裂韌性變化不大，但60 mm 闆厚Q500 qE母材的斷裂韌性在溫度降至－40℃以下後，有較大幅度的降低；各種闆厚的 Q500 qE 銲縫的斷裂韌性都比母材低；隨著溫度的下降，Q500qE 銲縫的斷裂韌性大幅降低，特彆是44和60 mm 闆厚Q500 qE銲縫。說明 Q500 qE銲縫的抗斷性能，尤其是低溫抗斷性能比母材要差很多。評定結果錶明：除60 mm闆厚 Q500qE母材－50℃時的CTOD值外，其它各種闆厚 Q500qE 母材的 CTOD 值均在失效評定麯線 FAD圖的可接受區域內，其斷裂韌性值是閤格的；32，44，60 mm 闆厚的 Q500qE 銲縫，僅有常溫及32 mm闆厚在－20℃的斷裂韌性是閤格的，與母材相比，Q500qE 銲縫的低溫抗斷性能較差。所以，對于 Q500 qE高性能橋樑鋼需要進一步加彊對銲縫性能的改善研究。
침대불동후도규격적Q500 qE고성능교량강모재화한접접두，재불동온도조건하진행료단렬인성CTOD시험，지재계통연구 Q500qE고성능교량강모재급기한접접두적단렬항력수온도적변화규률。시험결과표명：수착온도적강저，32화44 mm 판후 Q500qE 모재적단렬인성변화불대，단60 mm 판후Q500 qE모재적단렬인성재온도강지－40℃이하후，유교대폭도적강저；각충판후적 Q500 qE 한봉적단렬인성도비모재저；수착온도적하강，Q500qE 한봉적단렬인성대폭강저，특별시44화60 mm 판후Q500 qE한봉。설명 Q500 qE한봉적항단성능，우기시저온항단성능비모재요차흔다。평정결과표명：제60 mm판후 Q500qE모재－50℃시적CTOD치외，기타각충판후 Q500qE 모재적 CTOD 치균재실효평정곡선 FAD도적가접수구역내，기단렬인성치시합격적；32，44，60 mm 판후적 Q500qE 한봉，부유상온급32 mm판후재－20℃적단렬인성시합격적，여모재상비，Q500qE 한봉적저온항단성능교차。소이，대우 Q500 qE고성능교량강수요진일보가강대한봉성능적개선연구。
The fracture toughness( CTOD) of Q500qE high-performance bridge steel and welded joints were studied in this paper,w ith consideration of different steel thickness. T he focus w as the anti-fracture properties of Q500qE high-performance bridge steel and welded joints at different temperature. Research results reveal that the fracture toughness( CTOD) of 32 mm and 44 mm thickness Q500qE base metal changes little with decreasing temperature while that of 60 mm thickness Q500qE base metal is decreased obviously once temperatures down to -40 ℃. T he fracture toughness( CTOD) of various thickness of Q500qE weld metal is lower than that of the base metal. As the temperature drops,the fracture toughness( CTOD) of Q500qE weld metal is significantly reduced. In particular,the decrease of fracture toughness is more significant for 44 mm and 60 mm thickness Q500qE weld. It indicates that the fracture resistance of Q500qE weld metal is lower than that of the base metal,especially at low-temperature. Except for the base metal of 60 mm thickness Q500qE at -50℃,the CTOD values of other Q500qE base metal was within the acceptable areas of failure assessment curve( FAD diagram) and the fracture toughness( CTOD) values are qualified. For 32,44,60 mm thickness of Q500qE weld metal,the fracture toughness( CTOD) at room temperature is qualified. On the other hand,only the fracture toughness( CTOD) of 32 mm thickness of Q500qE weld metal is qualified at -20℃. Compared with the base metal,the fracture resistance of Q500qE weld metal at low temperature is poor. It is suggested that further research is needed for the performance of Q500qE welded material.
