摘要
随着温度的降低,结构钢材的主要断裂韧度指标发生变化。在低温(20,-10,-30,-50,-70或-65℃)条件下,测定了3种主要结构钢材(Q235A,16Mn和15MnVq)4种厚度(12,24,36和48mm)试样的断裂韧度JIC。总的趋势为3种结构钢材的断裂韧度JIC随着温度下降或厚度增加而减小,断裂韧度JIC随温度和厚度的变化曲线均呈"S"型,分为上平台、转变区和下平台3部分。在上、下平台区域,断裂韧度JIC的变化比较缓慢;在转变区,断裂韧度JIC急剧下降。在某些情况下,上平台区域会出现断裂韧度JIC随温度降低或厚度增加而提高的现象。
Toughness of structural steels is getting worse as temperature drops, and structural steels are liable to brittle fracture. Fracture toughness J_(IC) of three main structural steels(Q235A,16Mn and 15MnVq)of four thickness (12,24,36 and 48 mm) is measured at five temperature (20,-10,-30,-50,-70 or -65 ℃). The main trend is that J_(IC) of structural steel decreases as temperature drops or thickness increases. Curves of J_(IC) to temperature and J_(IC) to thickness are 'S' shapes, which are composed of three parts: upper platform, transition area and lower platform. J_(IC) varies slowly at upper platform and lower platform, while drops rapidly in transition area. In some cases, J_(IC) will increase at upper platform as temperature drops or thickness increases.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2005年第1期10-13,共4页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50078029)
