摘要
以蠕化率80%以上的发动机缸盖用蠕墨铸铁材料为研究对象,研究了RuT400和RuT450在室温至600℃时的拉伸性能和室温至450℃时的物理性能变化规律,并与HT280进行了对比。结果表明:蠕墨铸铁抗拉强度随温度升高缓慢下降,400~450℃后强度快速下降;灰铸铁抗拉强度随温度升高基本不变,但400℃以后强度下降明显;随温度升高,蠕墨铸铁和灰铸铁断后伸长率变化不大,但在350℃左右断后伸长率突然降低,之后快速增加,500℃达到最大值后急剧下降;室温到450℃时,蠕墨铸铁导热系数基本不变,但在300℃左右最高;灰铸铁导热系数直线下降;蠕墨铸铁热膨胀系数和比热容及变化趋势与灰铸铁基本一致,随温度升高而增加。
Taking vermicular graphite cast iron material used for engine cylinder head with vermicularizing rate of more than 80% as the research object,and compared with HT280,the tensile properties of RuT400 and RuT450 at room temperature to 600℃ and their physical properties at room temperature to 450℃ were studied.The results show that the tensile strengths of vermicular graphite cast irons decrease slowly with increasing temperature,and decrease rapidly after 400-450℃.The tensile strengths of gray cast irons are basically unchanged with the increase of temperature,but the strengths decrease obviously after 400℃.The elongations of vermicular cast irons and gray cast irons after breaking change little with the increase of temperature,but the elongations suddenly decrease at 350℃,then increase rapidly,and drop sharply after reaching the maximum at 500℃.At room temperature to 450℃,the thermal conductivities of vermicular graphite cast irons are basically unchanged,but the highest at about 300℃,however the thermal conductivities of gray cast irons plummet,and the thermal expansion coefficients and specific heat capacities of vermicular graphite cast irons and the trend of change are basically the same as that of gray cast irons,and increase with the increase of temperature.
作者
伍启华
李娜娜
王健
李玉娟
姜爱龙
彭广涛
冀露露
WU Qi-hua;LI Na-na;WANG Jian;LI Yu-juan;JIANG Ai-long;PENG Guang-tao;JI Lu-lu(Weichai Power Co.,Ltd.,Weifang 261061,Shandong,China;Weichai(Weifang)Material Molding Manufacturing Center Co.,Ltd.,Weifang 261061,Shandong,China)
出处
《铸造》
2025年第1期33-37,共5页
Foundry
基金
山东省自然科学基金项目(ZR2021ZD22)。
关键词
缸盖
蠕墨铸铁
高温拉伸性能
物理性能
灰铸铁
cylinder head
vermicular cast iron
high temperature tensile properties
physical properties
gray cast iron
