首页>
外国专利>
POST-WELD HEAT TREATMENT METHOD FOR WELDED JOINTS OF BAINITIC RAILS
POST-WELD HEAT TREATMENT METHOD FOR WELDED JOINTS OF BAINITIC RAILS
展开▼
机译:贝氏体钢焊接接头的焊后热处理方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
#$%^&*AU2018214003B220200206.pdf#####ABSTRACT The invention relates to the field of manufacturing technology of railway rails, and provides a post-weld heat treatment method for welded 5 joints of bainitic rails, which can control the longitudinal hardness of the tread of welded joints of bainitic rails within a reasonable range. The post-weld heat treatment method in the invention comprises the following steps sequentially performed: A. performing a first cooling for the welded joints with a temperature of 1500-1600°C to 150-250°C, wherein 10 the first cooling is naturally realized by air cooling; B. heating the welded joints to 880-960°C by an intermediate-frequency induction profiling electric heating coil and/or an oxygen-acetylene flame profiling heater; C. performing a second cooling for the welded joints, stopping the second cooling when the welded joints are cooled to 180-250 °C , and 15 immediately performing a third cooling to the room temperature of 5-40°C; wherein the second cooling is rapidly realized by applying a cooling medium, the initial cooling temperature of the second cooling is above 800°C, and the third cooling is naturally realized by air cooling.-- Longitudinal hardness curve of the rail 50-- head tread of welded joints -Measurement line of softened zone of welded joints -110 -100 -90 -80 -70 -50 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 Distance from the center of the welding seam/nmm Fig. I -4-Longitudinal hardness curve of the rail head tread ofweldedjoints - Measurement line of softened zone ofweldedjoints 10 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 Distance from the center ofthe welding seam/mm Fig. 2
展开▼