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4Cr13Si2钢的开发及其性能研究
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摘要
本文立足重庆大足龙水小五金刀剪行业的实际,以开发高性价比刀剪材料为出发点。在分析国内外刀剪材料现状后,指出目前国内开发马氏体不锈钢外刀剪用材的特点是:为保证刀剪的硬度及耐磨性,在提高含C量的同时增加钢中的Cr含量,并添加少量强碳化物形成元素如Mo和V等。显然,这是一条消耗稀有资源多且不经济的合金化路线。
     课题组根据多年的科研和实践,避免走传统的低性价比的Cr-Mo-V合金化路线,研制出有自主知识产权、高性价比的含适量Si的系列刀剪专用材料。本文研究的4Cr13Si2钢主要特点是:在4Cr13钢的基础上添加约2%的Si,使其在不显著影响钢的热机械加工性能的基础上,能强化铁素体基体,提高基体的强度、硬度和耐磨性能。而且,能显著改善钢的抗高温氧化性能。同时,适量的Cr和适量的Si可以保证钢的耐腐蚀性能。这一设计理念为新型马氏体不锈钢材料的开发提供了新的思路。
     在经过中频感应炉熔制、电渣重熔、精锻开坯和热轧退火后,得到40mm×6mm热轧退火扁板材。对材料进行硬度、金相、XRD、EBSD及拉伸力学性能分析。表明,退火板材组织晶粒细小均匀,强度和塑性较好。Si基本固溶于铁素体基体,碳化物含量少,且分布均匀;热处理工艺试验表明,4Cr13Si2钢作为刀具用材时,淬火温度以1050~1100℃为宜,淬火组织为淬火马氏体+少量残余奥氏体+少量碳化物,淬火硬度在HRC60左右。为保持高硬度,回火温度160~200℃,油中回火120min。1070℃淬火+180℃回火后弯曲力学性能试验表明,4Cr13Si2钢具有很好的强韧性能。其抗弯强度大于3200MPa,断裂挠度大于9mm,弯曲断口为具有塑性断裂和脆性断裂特征的混合型断口。
     在对0Cr13、5Cr15MoV、4Cr10Si2和4Cr13Si2钢在900~1150℃范围加热15min的抗高温氧化试验表明,抗高温氧化能力4Cr13Si2>4Cr10Si2>5Cr15MoV>0Cr13。电化学腐蚀试验表明,在1070℃淬火+180℃回火相同热处理条件下,4Cr13Si2钢抗电化学腐蚀性能与5Cr15MoV钢相当,并优于4Cr13钢和4Cr10Si2钢。
     用4Cr13Si2钢制作厨用切片刀,进行切削对比试验表明,4Cr13Si2钢锋利度持久性优于5Cr15MoV钢切刀,显著优于4Cr13钢切刀。
     对几种试验材料综合性能和价格方面进行了比较,4Cr13Si2钢价格略高于4Cr13、4Cr10Si2钢,但远低于5Cr15MoV钢,而其综合性能最好。以上研究和试验证明,4Cr13Si2钢是一种新型的高性价比的马氏体不锈钢刀剪材料。
     最后,成功地对4Cr13Si2钢进行了工业化生产,热轧出11.2吨δ=2.5mm的4Cr13Si2钢板材。
This paper based on the current conditions of the used materials for knives in Dazu Longshui town, Chongqing. In order to develop new materials with high cost performance, Analysis the status of marensitic stainless steel for knives at home and abroad, and points the developmental tendency of materials for knives which is increasing carbon and chromium, adding little molybdenum, vanadium and so on. Obviously, this will consume rare resources and is expensive.
     To avoid traditional Cr-Mo-V alloying mode. Series of Si contained steels are designed. 4Cr13Si2 steel is investigated in this paper, the main characteristics of 4Cr13Si2 steel is about 2% Si added in 4Cr13 steel. Silicon can strengthen the ferrite matrix to increase strength, hardness and wear resistance of material, and improve the performance of high-temperature oxidation resistance. At the same time, certain amount of Cr ensures the performance of corrosion resistance. This designing concept provides a new way of alloying of martensitic stainless steel.
     After smelting, electroslag remelting, finish forging, cogging down, hot rolling and annealing, 40mm×6mm flat steel is obtained. Then testing and analyzing hardness, metallographic, XRD, EBSD and tensile mechanical properties. The results show that the microstructure is highly unanimous with close grain, material own high strength and good plastic property. Si completely solid solution in ferrite sosoloid, carbon content is low and evenly distribution in matrix. The investigations on the heat treatment show that the appropriate quenching temperature for 4Cr13Si2 steel, which is used for making slicing knives was 1050~1100℃. The quench microstructures are queched martensite and little retained austensite, with a degree of hardness about HRC 60. In order to maintain a high degree of hardness which is essential to slicing knives, the tempering range had better be between 160~200℃, oil tempering 120min. The bending test samples, quenched under 1070℃, tempered under 180℃with 120min, are prepared. The results show 4Cr13Si2 steel own high strength and ductility which bending strength surpassing 3200MPa and break deflection beyond 9mm, the bend fracture show a mixed fractured, with a characteristic of plastic fracture and brittle fracture.
     Among the 0Cr13, 5Cr15MoV, 4Cr10Si2 and 4Cr13Si2 Steel the testing of resistance to high temperature oxidation test from 800℃to 1150℃shows that high-temperature oxidation resistance capacity 4Cr13Si2> 4Cr10Si2> 5Cr15MoV> 0Cr13. Electrochemical corrosion test shows that under the same condition, 1070℃quench + 180℃temper, the electrochemical corrosion resistance of 4Cr13Si2 steel is on the same level with 5Cr15MoV steel and better than 4Cr13 and 4Cr10Si2 steel.
     Produce slicing knives with 4Cr13Si2 flat steel. In the same shapness situation, cutting test of slicing knives made of 4Cr13Si2 steel, 5Cr15MoV steel and 4Cr13 steel shows that persistent sharpness of 4Cr13Si2 steel is better than 5Cr15MoV steel and significantly better than 4Cr13 steel.
     Comparing to the properties and the cost of the 4Cr13Si2 steel, 5Cr15MoV steel, 4Cr10Si2 steel and 4Cr13 steel. The cost of 4Cr13Si2 steel is slightly higher than the price of 4Cr13 steel and 4Cr10Si2 steel, much lower than 5Cr15MoV steel, but its own the best overall performance, all this show that 4Cr13Si2 steel is a high cost performance material.
     Finally, hot-rolled out 11.2 tons ofδ= 2.5mm 4Cr13Si2 steel plate. Industrialization of the 4Cr13Si2 steel is successful.
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