小冲杆试验测试3Cr1Mo1/4V钢制加氢反应器内试块的回火脆性  

Temper-Embrittlement of Tested Block in 3Cr1Mo1/4V Steel Hydrogenation Reactor Measured by Small Punch Test

作　　者：许立萌 关凯书(指导)[1] 

机构地区：[1]华东理工大学,承压系统与安全教育部重点实验室,上海200237

出　　处：《机械工程材料》2017年第5期84-88,共5页Materials For Mechanical Engineering

摘　　要：对运行10a的3Cr1Mo1/4V钢制加氢反应器内试块取样进行了脱脆热处理,与未热处理(脆化态)试样在不同温度下进行了小冲杆试验和夏比冲击试验,提出了以断裂能与最大载荷的比值(E_(SP)/F_m)作为确定小冲杆试验韧脆转变温度的方法,得到韧脆转变温度及其增量,并与夏比冲击试验结果进行了对比。结果表明:小冲杆试验得到的E_(SP)/F_m-温度曲线与夏比冲击试验得到的冲击功-温度曲线具有相同的变化趋势;与断裂能相比,E_(SP)/F_m可以更好地表征材料的韧脆状态;以E_(SP)/F_m稳定值的60%对应的温度作为韧脆转变温度,得到的韧脆转变温度增量与由夏比冲击试验得到的近似相等,小冲杆试验可以用来评价3Cr1Mo1/4V钢的回火脆性。The de-embrittlement heat treatment was conducted on specimens sampled from the tested block in a 3Cr1Mo1/4V steel hydrogenation reactor, which had runned for 10 a. And the small punch test and Charpy impact test were carried out on the de-embrittled specimens and non-heat treated （namely embrittled） specimens at different temperatures. A method using the ratio of fracture energy to maximum load （ESP/Fm） to determine the ductile- brittle transition temperature of small puch test was proposed. The ductile-brittle transition temperatures and the increments were obtained and compared with those from Charpy impact test. The results show that the changing trend of ESP/Fm-temperature curves obtained from small punch test had the same trend as the impact energy- temperature curves from Charpy impact test. Comparing to the fracture energy, ESP/Fm can present the ductile to brittle state better. Using the temperature corresponding to 60% of stabilized ESP/Fm as the ductile-brittle transition temperature, the obtained ductile-brittle transition temperature increment was nearly equal to that obtained by Charpy impact test. The small punch test can evaluate the temper-embrittlement of 3Cr1Mo1/4V steel.

关 键 词：小冲杆试验 韧脆转变温度 回火脆化 

分 类 号：TG115.5[金属学及工艺—物理冶金]