一种高强度低碳结构钢的回火脆性研究  

Research on Temper Brittleness of a High-strength Low Carbon Constructional Steel

作　　者：王树森 刘海涛[2] 杨景红[2] 薛钢[2] WANG Shusen LIU Haitao YANG Jinghong XUE Gang(Military Representative Office of the Navy in Anshan, Anshan 114000, China Luoyang Ship Material Research Institute, Luoyang 471023, China)

机构地区：[1]海军驻鞍山军代表室,辽宁鞍山114000 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2016年第6期28-31,共4页Development and Application of Materials

摘　　要：通过夏比冲击试验研究了回火温度对高强度低碳结构钢冲击韧性的影响,并采用扫描电镜、透射电镜分析了产生回火脆性的机理。结果表明,该高强度钢在580℃、610℃较高温度回火时产生回火脆性,-20℃夏比冲击功由238 J(550℃时)降低至19 J(580℃时),冲击断口由韧性断裂转变为脆性断裂,这主要是由于晶界上析出大量较大尺寸的含钼M23C6脆性相,在晶界上起到了裂纹源的作用。Effects of tempering temperuture on the impact toughness of an high strength low carbon constructional steel was studied by charpy impact test,and the mechanism of the temper brittleness was analysed by SEM and TEM. The results showed that temper brittleness of the low carbon constructional steel appeared when the higher tempering temperatures were 580 ℃ and610 ℃,the charpy impact energy at- 20 ℃ was reduced from 238 J（ tempered at 550 ℃） to 19 J（ tempered at 580 ℃） and the impact fracture was changed from ductile to brittle. The temper brittleness was mainly due to the many large sized brittle precipitation of M23C6 phase containing Mo at the grain boundary,which was the source of the crack.

关 键 词：高强度低碳结构钢 冲击功 回火脆性 晶界 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]