12Cr1 MoV钢SW-CCT曲线的测试  

Testing study on SW-CCT diagram of 12Cr1MoV steel

作　　者：胡艳华[1] 陈芙蓉[1] 解瑞军[1] 李海涛[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051

出　　处：《焊接学报》2010年第12期41-44,共4页Transactions of The China Welding Institution

基　　金：内蒙古自然科学基金资助项目(200711020710)

摘　　要：针对12Cr1MoV钢焊缝区金属相变研究这一空白,以温度作为实时检测的变量,实时记录焊接过程中焊缝区的温度变化,提取实际焊接热过程中的峰值温度和实时的冷却速度,作为绘制12Cr1MoV钢焊缝区连续冷却转变(SW-CCT)曲线的热模拟工艺.借助热模拟试验机,辅以实际的焊接冷却速度,得到12Cr1MoV钢的SW-CCT曲线.当t8/3段的平均冷却速度小于1.7℃/s时,12Cr1MoV钢焊缝区金属的室温组织为铁素体(F)+珠光体(P)+贝氏体(B);冷却速度小于4.7℃/s时,室温组织为P+B;冷却速度小于33℃/s时,室温组织为B;冷却速度大于33℃/s时,室温组织为马氏体(M).焊缝区金属热模拟样的室温组织观察结果、维氏硬度测试结果与SW-CCT曲线的测试结果一致.Temperature was selected as variable to study phase transformation in weld metal of 12Cr1MoV steel and realized in-situ detection of temperature in weld metal.The maximum temperature and cooling rates during welding were acquired to form the simulation technology of 12Cr1MoV steel in weld metal,and the SW-CCT diagram of 12Cr1MoV steel were obtained by the thermal simulation equipment with extracted cooling rates.When the average cooling rate of t8/3 is under 1.7 ℃/s,the microstructure in weld metal of 12Cr1MoV steel is ferrite（F）＋perlite（P）＋bainite（B）;under 4.7 ℃/s,the microstructure is P＋B;under 33 ℃/s,the microstructure is B;over 33 ℃/s,the microstructure is martensite（M）.The optical microstructures of typical cooling rates are coincident with the test results of SW-CCT.The Vikers hardness increases with the increasing of cooling rates.

关 键 词：12CR1MOV钢 焊缝区 SW-CCT曲线 

分 类 号：TG441.3[金属学及工艺—焊接]