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在650℃采用等径弯曲通道变形(ECAP)方法对原始组织为层片状珠光体的GCr15钢进行了Bc方式的多道次变形。采用透射电镜和洛氏硬度等实验方法,对不同道次下的组织特性和硬度进行了分析。结果表明:冷变形和温变形都能使渗碳体片层发生球化,但一道次温变形情况下渗碳体球化程度明显高于冷变形一道次,硬度值由原始态(层片状珠光体)的42 HRC分别降至38 HRC(冷变形)、27 HRC(温变形),温变形二道次后,铁素体基体接近等轴状,平均晶粒尺寸约为0.4μm,球化完全的渗碳体颗粒粒径约为0.1μm,硬度值由27 HRC(温变形一道次)增至32 HRC左右。
The multi-pass deformation of GCr15 steel with lamellar pearlite was carried out at 650 ℃ by the method of equal path bending channel deformation (ECAP). Transmission electron microscopy and Rockwell hardness test methods were used to analyze the microstructure and hardness of different passes. The results show that both cold deformation and warm deformation can make the cementite lamellae spheroidize. However, under the condition of secondary temperature deformation, the degree of spheroidization of cementite is obviously higher than that of cold deformation, and the hardness value is from the original state Pearlite) of 42 HRC were reduced to 38 HRC (cold deformation), 27 HRC (temperature deformation), after two warm deformation, the ferrite matrix nearly equiaxed, the average grain size of about 0.4μm, spheroidization The size of complete cementite particles is about 0.1 μm and the hardness value increases from 27 HRC (warm deformation in one pass) to around 32 HRC.