摘要
基于小冲孔试验技术建立栽荷-位移曲线中弹塑性转变温度、最大载荷、断裂位移与材料屈服强度、抗拉强度、断后延伸率之间的关联,从而分析不同热损伤条件下304不锈钢以及Q345R钢的力学性能变化。结果表明:相比于新材料,不同损伤参数下材料力学性能发生明显变化并可以使用小冲孔试验进行合理分析。随着损伤时间的延长,2种材料的屈服强度和抗拉强度均会出现一定程度下降,而在热损伤12 h后304不锈钢的抗拉强度基本不变。损伤时间达到48 h时,损伤温度的提高将会导致材料屈服强度和抗拉强度的明显下降。304不锈钢的断后延伸率随着损伤温度的升高逐步增加,而Q345R钢的断后延伸率则存在一定的分散性。
To analyze the mechanical properties of materials under different thermal damage conditions, three important parameters were obtained from the load-displacement （L-D） curves based on small punch test for the elastic plastic transition load, maximum load and fracture displacement. Results showed that property evolutions could be accurately estimated by small punch test.There was a significant change of mechanical properties under different thermal damage conditions. With the increase of damage time, the yield strength and the ultimate tensile strength would decrease. The degradation of ultimate tensile strength would become unapparent when damage time was more than 12 h.Meanwhile ,the increase of the damage temperature would result in the decrease of the yield strength and the ultimate tensile strength when damage time reached 48 h. The fracture displacement analysis indicated that tensile elongation of 304 stainless steel would increase with higher temperature, while the change of the ultimate tensile strength of Q345R was not evident.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2016年第1期45-49,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家高技术研究发展计划(863计划)(2012AA040105)
江苏省普通高校研究生科研创新计划(KYZZ15_0229)
关键词
小冲孔试验
热损伤
力学性能
small punch test
thermal damage
mechanical properties
