摘要
采用不同的离心铸造工艺参数对Ti Al基合金汽车气阀进行了铸造,并在500℃进行了力学性能和耐磨损性能的测试与分析。结果表明：与1600℃浇注的试样相比, 1645℃浇注的试样抗拉强度和屈服强度分别增大了16%和21%,磨损体积减小了40%;与200℃模具预热温度相比,模具预热温度为240℃时试样的抗拉强度和屈服强度分别增大了15%和21%,磨损体积减小了26%;与旋转速度1000 r/min相比,当旋转速度为2500 r/min时离心铸造试样的抗拉强度和屈服强度分别增大了14%和22%,磨损体积减小了37%。随浇注温度从1600℃上升至1660℃,或模具预热温度从200℃上升至260℃,或旋转速度从1000 r/min增加至3000 r/min,力学性能和耐磨损性能均先提高后下降。Ti Al基合金汽车气阀的浇注温度、模具预热温度和旋转速度分别优选为1645℃、240℃和2500 r/min。
The Ti Al based alloy automobile air valves were cast by different centrifugal casting process parameters. And the mechanical properties and wear resistance at 500 ℃ were tested and analyzed. The results show that compared with the sample cast at 1600℃, the tensile strength and yield strength of specimen cast at 1645 ℃ increase by 16% and 21% and the wear volume decreases by 40%; compared with the sample the under the mold preheating temperature of 200 ℃, the tensile strength and yield strength of the specimen increase by 15% and 21% respectively, and the wear volume decreases by 26%under the mold preheating temperature of 240℃; compared with the sample the under the rotation speed of 1000 r/min,the tensile strength and yield strength of the centrifugal casting sample increase by 14% and 22% respectively, and the wear volume decrease by 37%, under the rotational speed of 2500 r/min. With the pouring temperature increasing from 1600℃ to1660℃, or mold preheating temperature increasing from 200℃ to 260℃, or the rotational speed increasing from 1000 r/min to 3000 r/min, the mechanical properties and wear resistance increase firstly and then decrease. The optimized pouring temperature, mold preheating temperature and rotational speed are 1645 ℃, 240 ℃ and 2500 r/min respectively.
作者
严世同
杨志刚
YAN Shitong;YANG Zhigang(Chongqing College of Electronic Engineering, Chongqing 401331, China;School of Mechanical and Electrical and Automobile Engineering, Chongqing Jiaotong University, Chongqing 400074, China)
出处
《热加工工艺》
CSCD
北大核心
2018年第19期115-118,共4页
Hot Working Technology
基金
重庆市科学技术委员会项目(cstc2012jjA40028)
关键词
离心铸造
汽车气阀
力学性能
耐磨损性能
centrifugal casting
automobile air valve
mechanical property
wear resistance
