论文部分内容阅读
工程机械缸套在运行过程中,容易产生因45钢硬度低而导致表面产生磨损失效的现象,缩短了缸套的使用寿命。针对这一缺点,本试验采用等离子表面淬火热处理工艺对工程机械缸套的内壁进行局部硬化处理,实现自激冷却淬火,生成硬度极高的淬火硬化层,组织为高硬度的隐针马氏体。结果表明:随工作电流的增加,淬火层硬度也趋于上升;而伴随着扫描速度或波头数的增大,单道与交叉道的硬度均呈下降趋势。经等离子表面淬火热处理后的试样表面比未淬火的原始试样耐磨性提高了5~6倍。
Construction machinery cylinder liner in the process of running, easy to produce due to low hardness of 45 steel surface wear and tear caused by the phenomenon of failure, reducing the service life of cylinder liner. In response to this shortcoming, the test using plasma surface hardening heat treatment process on the inner wall of construction machinery cylinder liner partial hardening to achieve self-quenching quenching to generate a very high hardness quench hardened layer of high hardness hidden needle martensite . The results show that the hardness of quenched layer tends to increase with the increase of operating current, while the hardness of single track and cross track decrease with the increase of scanning speed or wave number. After plasma surface hardening heat treatment of the sample surface than the original quenched non-hardened increased 5 to 6 times.