模具温升对22MnB5硼钢裸板高温摩擦磨损特性的影响  

Effect of Mold Heating on High-Temperature Friction and Wear Characteristics of Uncoated 22MnB5 Boron Steel

作　　者：蒋怡涵 吴佳松 王武荣[1] 韦习成[1] JIANG Yihan;WU Jiasong;WANG Wurong;WEI Xicheng(School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《上海交通大学学报》2021年第3期258-264,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(51475280)资助项目。

摘　　要：采用自制板带式高温摩擦磨损试验机模拟实际热冲压条件下22MnB5硼钢裸板的高温摩擦过程,对模具进行预热,模拟了热冲压过程中的模具升温,并通过硼钢热冲压的摩擦因数、表面磨损形貌和截面图及基体组织图研究模具升温对硼钢裸板摩擦行为及机理的影响.结果表明:模具升温较低时,硼钢裸板与H13钢之间的摩擦因数基本稳定在0.5,其磨损机理以磨粒磨损和黏着磨损为主.当模具升温超过100℃,硼钢裸板摩擦因数随温度升高呈现下降趋势,在150℃和200℃分别为0.474和0.414,黏着磨损作用减弱.硼钢基体维氏硬度在室温至100℃基本稳定在430,随温度进一步升至150℃和200℃,硬度分别降至413.5和399.7,表明模具升温对成型件机械性能有显著影响.A self-developed strip-type high-temperature friction and wear test device was used to simulate the high-temperature friction process of uncoated 22MnB5 boron steel under actual hot stamping conditions.The mold was preheated to simulate the temperature increase of the die in the hot stamping process.The effects of mold temperature on the friction behavior and mechanism of uncoated boron steel were studied by using the friction coefficient test,surface wear morphology observation,and cross-section and matrix structure chart of hot stamping boron steel.The results show that the friction coefficient between the uncoated boron steel and the H13 steel is basically stable at 0.5 when the temperature of the mold is low,and the wear mechanism is mainly classified to abrasive wear and adhesive wear.Besides,when the mold temperature exceeds 100℃,the friction coefficient of the uncoated boron steel decreases from 0.474 to 0.414 with an increase of temperature from 150℃to 200℃,inferring that the adhesive wear is weakened.The Vickers hardness of the boron steel matrix is approximately close to 430 from room temperature to 100℃.Moreover,with the temperature further rising to 150℃and 200℃,the hardness decreases to 413.5 and 399.7 respectively,which indicates that the mold temperature has a significant effect on the mechanical behavior of formed parts.

关 键 词：热冲压 22MnB5裸板 高温摩擦磨损 模具升温 

分 类 号：TG115[金属学及工艺—物理冶金]