共查询到19条相似文献,搜索用时 156 毫秒
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研究了稀土硅铁(RE-Si-Fe)添加剂对高铬铸铁堆焊合金组织的细化作用。采用光学显微镜对不同RE-Si-Fe加入量高铬铸铁堆焊合金的显微组织进行了观察;采用砂带式摩擦磨损试验机对其表面的耐磨性进行了评价,并采用扫描电镜对磨损形貌进行了观察;采用热力学计算和错配度计算分别讨论了Si和RE元素对高铬铸铁堆焊合金组织演变的影响。结果表明,RE-SiFe可以细化高铬铸铁堆焊合金的显微组织,提高其耐磨性。其原因为RE在堆焊冶金反应中生成的一系列稀土化合物,与M7C3型碳化物有良好的界面匹配,可以成为M7C3型碳化物的非均质化形核核心,细化了该碳化物。 相似文献
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含Cr13%高铬铸件的试验研究 总被引:3,自引:0,他引:3
在试验的基础上研究了含Cr13%的高铬铸铁的力学性能和组织特点,发现含硅量和变质处理对不同基体的高铬铸铁具有相似的影响规律;根据Fe-C-Cr三元相图对Cr13%高铬铸铁的凝固过程进行了分析,从一个新的角度揭示了铸造条件、含硅量和变质质处理对高铬铸铁性能和组织的影响机理。 相似文献
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Effects of RE,V, Ti and B composite modification on the microstructure and properties of high chromium cast iron containing 3% molybdenum 总被引:1,自引:0,他引:1
The effects of RE, V, Ti and B on the microstructure and properties of high chromium cast iron containing 3% molybdenum under
as-cast and heat treatment conditions were investigated with the method of comparing experiments. The results show that with
the increase of RE content, the primary austenite of high chromium cast iron is obviously refined. The morphology of carbide
is changed from netlike and lath to small multiangular isolated blocks or massive blocks, the isolated degree of carbide is
improved obviously, and the size is significantly refined. The addition of V and B into high chromium cast iron can refine
the microstructure, reduce coarse columnar crystals and make the carbide smaller and uniform. Through composite modification
with RE, V, Ti and B, the hardness, wear resistance and impact toughness of high chromium cast iron are increased conspicuously.
After heat treatment, the hardness of high chromium iron is increased significantly, but the toughness and wear resistance
do not show great improvement. 相似文献
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利用光学显微镜、洛氏硬度计等研究了不同淬火工艺对Cr26高铬耐磨铸铁组织与硬度的影响。结果表明:铸态Cr26高铬铸铁组织主要由初生奥氏体和碳化物组成。经980~1060 ℃不同温度淬火、空冷后,高铬铸铁组织中有大量二次碳化物析出。随着淬火温度的升高,析出的二次碳化物先增加后减少,试样硬度先升高后降低。1020 ℃淬火试样硬度达到峰值,为65.7 HRC。1020 ℃淬火高铬铸铁,经空淬、油淬和水淬不同方式冷却,随着冷却速度的增大,高铬铸铁组织中碳化物颗粒、碳化物比例逐渐增大,硬度逐渐增大,其中水淬高铬铸铁试样硬度最大,达到68.2 HRC。 相似文献
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ZHANG Anfeng Xinjiang Engineering College Urumqi ChinaXING Jiandong LU Wenhua Xi''''an Jiaotong University Xi''''an China associate professor Department of Mechanical Engineering Xi''''an Jiaotong University Xi''''an China 《金属学报(英文版)》1993,6(12):447-452
The oxidation behaviour of high Cr Cast iron was investigated at 950 and 800℃ in termsof Cr content in matrix and the amount of carbide.The morphology and types of oxidefilms and the microstructure of subsurface were also examined.The main conclusionsare:1)The original chromium content in the matrix determines the type of oxide filmand it is an important factor for the oxidation resistance of high chromium cast iron;2)The oxidation resistance improves with increasing carbide content at 950℃ because ofthe decomposition of the carbide,while the decompsition of the carbide do not take placeat 800℃ so the oxidation resisteance do not improve with increasing carbide volume. 相似文献
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轧辊表面氧化膜的形成及剥落对轧辊的消耗及产品质量有显著影响。采用VL2000DX—SVF18SP型超高温激光共聚焦显微镜观察了高铬铸铁、高铬铸钢和高速钢在连续加热及等温过程中其表面氧化膜形成的特征,同时对比研究了这3种材料在循环加热、冷却后的氧化行为。结果表明,高铬铸铁和高铬铸钢开始形成氧化膜的温度较低,约为300 ℃,但氧化膜致密均匀,抑制了高温及等温过程氧化膜的生长;而高速钢氧化膜开始形成温度较高,氧化膜快速形成的温度约为480 ℃,但氧化膜均匀性差,具有较快的生长速率,高速钢的抗氧化性显著低于高铬铸铁和高铬铸钢。 相似文献
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轧辊表面氧化膜的形成及剥落对轧辊的消耗及产品质量有显著影响。采用VL2000DX-SVF18SP型超高温激光共聚焦显微镜观察了高铬铸铁、高铬铸钢和高速钢在连续加热及等温过程中其表面氧化膜形成的特征,同时对比研究了这3种材料在循环加热、冷却后的氧化行为。结果表明,高铬铸铁和高铬铸钢开始形成氧化膜的温度较低,约为300 ℃,但氧化膜致密均匀,抑制了高温及等温过程氧化膜的生长;而高速钢氧化膜开始形成温度较高,氧化膜快速形成的温度约为480 ℃,但氧化膜均匀性差,具有较快的生长速率,高速钢的抗氧化性显著低于高铬铸铁和高铬铸钢。 相似文献