基于小尺寸试样的主曲线参考温度T_0的确定方法  

Reference Temperature Determination of Master Curve for 16MnR Steel Using Small Specimens

作　　者：曹昱澎[1] 惠虎[1] 轩福贞[1] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《压力容器》2011年第7期17-23,共7页Pressure Vessel Technology

基　　金：国家自然科学基金(50705029);国家高技术研究发展计划资助项目863计划(2009AA04Z421)

摘　　要：采用16MnR钢进行了标准1英寸,0.5英寸和预制裂纹的夏比尺寸三点弯试样的断裂韧性试验,得到了试样尺寸对主曲线参考温度T0的影响。发现0.5英寸试样在满足ASTM E1921标准的情况下,所确定的T0明显低于标准1英寸试样确定的T0,表明ASTM E1921限定试样变形极限的M值不够保守,且夏比尺寸试样无法计算T0。提出了Beremin模型的拘束度修正,经过修正大幅缩小了小尺寸试样确定的T0与1英寸试样确定的T0之间的差异。The size effect on master curve reference temperature for 16MnR was studied using 1 T-SE（B）,0.5 T-SE（B） and PCVN specimens.It is found that the allowable limit of M specified in ASTM E1921 is un-conservative.Although T0 value from 0.5 T-SE（B） is valid according to E1921,it is much lower than the 1 T-SE（B） result.However,the T0 from PCVN data is invalid.The fracture toughness data from 0.5 T and PCVN specimens were scaled to the 1 T size by using Beremin model.Taking account of the constraint effect,the difference between T0 values measured using small specimens and 1 T specimen is obviously decreased.

关 键 词：主曲线 Beremin模型 拘束度 韧脆转变 

分 类 号：TG113.25[金属学及工艺—物理冶金] TQ050.2[金属学及工艺—金属学]