【摘要】 本文研究了调质工艺对40CrNiMoA钢板焊接接头显微组织及力学性能的影响。试验结果表明,经830～870℃+550～650℃调质处理后,40CrNiMoA钢3 mm板90 A 10 V焊接接头的焊缝区、热影响区、母材区的硬度差异显著减小,形成了回火索氏体组织。调质处理温度越高,焊接接头的焊缝区、热影响区与母材区的组织越均匀,且组织中的碳化物颗粒尺寸增大。40CrNiMoA钢焊接板经850℃油淬、600℃回火后,具有较高的强度(905MPa)和塑性(13.5%),综合力学性能最优。更多还原

【Abstract】 Effect of quenching and tempring process on the microstructure and mechanical properties of 40 CrNiMoA steel welded joints was studied in this paper.The test results indicated that by queching+tempering at 830～870 ℃+550～650 ℃ the 40 CrNiMoA steel 3 mm plate at 90 A 10 V welded joint hardness difference between weld zone,heat affected zone,and base metal zone is reduced significantly,and tempered sorbite structure is formed.The higher quenching and tempering temperature,the more uniform microstructure among the weld zone,heat affected zone and base metal of welded joint,and the cementite particle grew up in structure.The 40 CrNiMoA steel welded joint after oil quenching at 850℃ and tempering at 600 ℃ has higher strength(905 MPa) and plasticity(13.5%).In this case,the comprehensive mechanical properties are best.更多还原