锻压技术

ECAE工艺处理对GCr15钢显微组织及力学性能的影响

英文标题：Effects of ECAE treatment on the microstructure and mechanical property of GCr15 steel

作者：王小飞高巍

关键词：GCr15钢 ECAE 显微组织硬度

分类号：TG142.72

出版年,卷(期):页码：2014,39(6):125-127

摘要：

对GCr15钢进行高温ECAE工艺处理，对处理后的试样进行显微组织观察分析并且对挤压前后GCr15钢力学性能进行测试。试验结果表明：在温度为950 ℃时，经单道次ECAE挤压后合金具有相对高的硬度580 HV，相对挤压前硬度提高了61％； GCrl5钢的显微组织与未挤压试样相比晶粒发生了很大的变形；GCr15钢试样原始组织为直径50 μm的粗大等轴晶粒，经单道次ECAE挤压后，晶粒被显著细化到挤压后的8 μm 左右，原始的GCrl5钢晶粒等轴组织在剪切力的作用下被粉碎并且沿剪切方向明显被拉长，形成了带状组织，原来多角状和大块的第二相颗粒被粉碎成细小的颗粒均匀弥散分布在基体中，使显微组织得到显著细化。

Through the study of high temperature ECAE process of GCr15 steel processing, the microstructure after heat treatment was observed and the mechanical properties of GCr15 steel before and after extrusion were tested.The results show that compared to GCrl5 steel before extruding，the GCrl5 steel extruded by single-pass ECAE has a relatively high hardness of 580 HV at the temperature of 950 ℃ which is improved by 61%.Also the grain deforms a lot from original organization of coarse equiaxed grain with diameter of about 50 μm before extruding to remarkably refine grain with diameter of about 8 μm after single-pass ECAE. The equiaxed grain of original GCrl5 steel under the action of shear forces is crushed and stretched in the shearing direction，which forms a band structure.The original multi-angular and large second phase particles are crushed into small particles and uniformly dispersed in the matrix, which significantly refines the microstructure.

基金项目：

郑州市科技局项目(002010)

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