Study on Production Process,Microstructure and Properties of 12MnNiVR Steel for High Heat Input Welding
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摘要: 采用两种不同的生产工艺试制了大热输入焊接用钢12MnNiVR,利用光学显微镜、拉伸试验机、低温冲击韧性试验机对试验钢的微观组织和力学性能进行了检验,以及利用热处理试验炉模拟了试验钢的焊后热处理行为。结果表明:采用在线淬火+离线回火工艺生产的试验钢,其组织为大量的回火索氏体和少量的回火贝氏体,同时大量的碳化物均匀地分布在铁素体基体上。而采用调质工艺生产的试验钢,室温组织由轧制态下的铁素体和珠光体组织转变为调质后更加均匀的回火索氏体加大量弥散析出的碳化物。两种工艺生产的试验钢均表现为良好的综合力学性能,而且经模拟焊后热处理试验后,其性能未发生明显的下降。在线淬火+离线回火工艺具有无需再次升温加热的优点,能够替代调质工艺,对降低企业的生产成本具有积极重要的作用。Abstract: The high heat input welding steel 12MnNiVR was trial-produced by two different production processes.The microstructure and mechanical properties of the tested steel were obtained by optical microscope,tensile testing machine and low-temperature impact toughness testing machine,and the post-welding heat treatment behavior of the test steel was simulated by heat treatment test furnace.The results show that the tested steel produced by on-line quenching and off-line tempering process has a large amount of tempered sorbite and a small amount of tempered bainite,and a large number of carbides are evenly distributed on the ferrite matrix.In the quenched and tempered steel,the microstructure at room temperature changes from as-rolled ferrite and pearlite to more homogeneous tempered sorbite with more dispersed carbide after quenching and tempering.The tested steels produced by the two processes both exhibit excellent comprehensive mechanical properties,and after simulated post-weld heat treatment test,their properties did not decrease significantly.The on-line quenching and off-line tempering process has the advantage of eliminating reheat procedure,then can replace the quenching and tempering process,and has a positive and important role in reducing the production cost.
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