无塑性转变温度（NDTT）实质的探讨  

Study of the Nature of Nil-Ductility Transition Temperature(DTT)

作　　者：关国军 穆振芬 王欣[1] 李金平[1] 姚枚[1] 

机构地区：[1]哈尔滨锅炉有限责任公司,哈尔滨工业大学

出　　处：《材料科学与工艺》1996年第1期55-59,共5页Materials Science and Technology

摘　　要：通过１６Ｍｎ钢落锤试样在系列温度下的静载弯曲试验，发现其断裂行为与脆性堆焊焊道及热影响区的存在无关，用于做静态三点弯曲试验的落锤试样表现出与母材相同的冷脆转变特性。落锤试样的堆焊焊道相当于对试样引入一个动态裂缝。文中提出，ＮＤＴＴ实质是在动载条件下材料冷脆特征温度的反映，若以ＮＤＴＴ做为设计指标，则偏于安全。The fracture behavior of the drop-weight specimens for 16Mn steel in slow ending at a series of temperatures were investigated,which is not affected by both the weld seam and the HAZ (heated-affect-zone).The results showed that the fracture load of the drop-weight specimens in three-point slow bending takes a steep transition at the characteristic transition temperature of brittleness of the parent metal.Therefore the weld seam of the drop-weight specimens is equivalent to dynamic crack and then we come to the conclusion that the nature of NDTT characterizes the characteristic transition temperature of brittleness in dynamic loading conditions.If NDTT was in design then particular safety was stressed.

关 键 词：无塑性转变温度 落锤试验 冷脆特征温度 

分 类 号：TG115.5[金属学及工艺—物理冶金]