微弧等离子45钢表面淬火硬化层性能分析  

Properties of 45 carbon steel hardened by micro-plasma

作　　者：汪刘应[1,2] 刘顾[1] 黄国鹏[3] 华绍春[1] 

机构地区：[1]第二炮兵工程学院5系,西安710025 [2]西安交通大学电子陶瓷与器件教育部重点实验室,西安710049 [3]7435工厂二炮军代室,武汉430060

出　　处：《焊接学报》2009年第6期91-94,共4页Transactions of The China Welding Institution

摘　　要：运用均匀设计试验法,制定了以电弧电流、喷枪移动速度、气体流量、喷枪与工件间距为参数的淬火工艺试验方案,实现了微弧等离子45钢表面淬火强化.利用金相显微镜、电子扫描显微镜、显微硬度计、磨损试验机等试验手段,重点围绕淬火硬化层显微组织、力学性能以及硬化机理进行了较为系统的试验研究.结果表明,微弧等离子淬火热影响区小,试样冷却速度大,硬化层晶粒细小,组织致密,为板条状和针状马氏体混合组织,硬度由45钢基体的200HV0.2提高到600HV0.2左右,耐磨性提高了8.5～26.7倍.Uniform experiment design was applied to hardened 45 carbon steel with micro-plasma arc,including the design parameters such as arc current,scanning speed,gas flow and hardening distance.The structures,mechanical properties and hardening mechanism of hardened layers were analyzed by means of testing instruments,such as optical microscope,scanning electron microscope,microhardness tester and wear tester.Results show that because of the small influencing area and the extremely high cooling speed,surface hardened layer consists mainly of lath martensite and plate martensite of fine and dense structure,the microhardness of hardened layer increases from 200 HV0.2 to 600 HV0.2,and the wear resistance is about 8.5-26.7 times as much as the 45 carbon steel.

关 键 词：微弧等离子 淬火 组织结构 相变硬化 磨损 

分 类 号：TG156.3[金属学及工艺—热处理]