Effects of Chromium Addition Forms on Microstructure and Properties of Powder Metallurgy Sintering Fe-2Cu-3Cr-0.8C Alloy
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摘要: 分别以纯铬粉、商用低碳Cr-Fe粉、自制机械合金化Cr-Fe粉等3种形式将铬元素引入到原料粉中，经700 MPa压制成型和1 200℃烧结1.5 h后制备得到Fe-2Cu-3Cr-0.8C合金，研究了铬元素添加形式对合金显微组织和性能的影响。结果表明：不同铬添加形式下，烧结试样的组织均以珠光体为主，同时含有少量铁素体和碳化物，其中添加机械合金化Cr-Fe粉烧结试样的组织均匀，珠光体含量较多，致密程度较高，烧结密度为7.07 g·cm-3；添加机械合金化Cr-Fe粉烧结试样的综合力学性能最佳，硬度为95 HRB，抗拉强度为448 MPa，拉伸断口形貌主要为韧窝，其断裂形式是以韧性断裂为主的韧-脆混合断裂；添加机械合金化Cr-Fe粉烧结试样的腐蚀质量损失最小，耐腐蚀性能最好。Abstract: Chromium element was added into raw material powder in the forms of pure Cr powder, commercial low carbon Cr-Fe powder and self-made mechanically alloyed Cr-Fe powder, respectively. The powders were pressed at 700 MPa and sintered at 1 200℃ for 1.5 h, and then Fe-2Cu-3Cr-0.8C alloy was obtained. The effects of chromium addition forms on the microstructure and properties of the alloy were studied. The results show that the microstructures of sintered samples were composed of pearlite and a small amount of ferrite and carbides with different adding forms of chromium. When added with the mechanically alloyed Cr-Fe powder, the sintered sample showed a homogeneous microstructure, and had relatively more pearlite; the sample had a relatively high compact degree with the sintering density of 7.07 g·cm-3; the sintered sample had excellent comprehensive mechanical properties with the hardness of 95 HRB and tensile strength of 488 MPa; the morphology of tensile fracture was mainly dimple, and the fracture form was a ductile-brittle mixed fracture with ductile fracture as the main fracture; the sample had the least corrosion mass loss, indicating that the sample had the best corrosion resistance.
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Keywords:
- powder metallurgy sintering /
- chromium element /
- mechanical property /
- microstructure
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