Wire and arc additive manufacturing for mold material RMD545
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摘要: 针对耐磨堆焊药芯焊丝RMD545,进行单层单道熔敷成形工艺试验,分析其成形特点并确定了良好成形工艺区间。选取合适参数进行了多层单道熔敷成形工艺试验,表面成形良好,无明显缺陷。对单层单道和多层单道组织性能进行分析,结果表明,随着电流的增大,冷却速度减慢,单层单道组织中马氏体转变量逐渐减小,贝氏体转变量逐渐增多,硬度随之降低;多层单道熔敷层不同位置经历的热过程不同,组织性能有较大差异,从底部到顶部组织依次为回火马氏体+针状铁素体+少量贝氏体、马氏体+贝氏体+少量针状铁素体、板条马氏体,硬度分布在350~500 HV之间。拉伸试验表明成形件综合力学性能良好,满足相关模具材料修复的性能要求。
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关键词:
- 电弧增材制造 /
- 成形工艺 /
- 组织性能 /
- 模具材料RMD545
Abstract: This research focused on wire and arc additive manufacturing for mold material RMD545 and the experiment of single layer and single bead deposition forming technology was carried out. The forming characteristics were analyzed and the interval of good forming technology was determined. The multi-ayer single-bead deposition forming technology test was carried out with proper parameters and the surface was well formed without obvious defects. The microstructure and properties of single-layer single-bead and multi-layer single-bead were analyzed. The result showed that with the increase of depositing current, the cooling rate slowed down, the martensite transformation decreased and the bainite transformation increased in single-layer single-bead microstructure, which led to a lower hardness. During the multi-layer single-bead depositing process, different layer had different thermal processes. It made a microstructure variation along the height direction. Microstructures from bottom to top were tempered martensite + acicular ferrite + tiny amounts of bainite, martensite + bainite + tiny amounts of acicular ferrite, and lath martensite. The hardness ranged from 350 HV to 500 HV. The tensile test showed that mechanical properties of the additive manufacturing wall structure could meet the performance requirements of the mold repairing. -
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