新型锯片基体用钢51CrV4的研究与开发

doi:10.13228/j.boyuan.issn0449-749x.20150255

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摘要 51CrV4钢因具有良好的热处理性能与力学性能，广泛用作为高等级弹簧钢。为改善现有锯片钢的不足，根据51CrV4特有的化学成分，创新性地将其用于制造金刚石焊接锯片基体。通过研究动态CCT曲线，卷取温度对显微组织与第二相析出物的影响，淬火与回火工艺对碳化物尺寸、晶粒尺寸、力学性能的影响，评估了51CrV4钢用于制造金刚石焊接锯片基体的可行性。结果表明：卷取温度升高，先共析铁素体尺寸与珠光体片层间距变大，10 nm粒径以下的(V，Cr)C析出物在MC相析出物中所占的比例减少；淬火温度由800提高到900 ℃时，奥氏体晶粒尺寸先缓慢变化，随后快速长大，固溶的碳化物质量分数增多，回火后锯片硬度增强，而回火温度由450提高到550 ℃时，马氏体板条界片层状渗碳体逐步球化，强度明显下降，塑性小幅提高；设定合适的卷取温度控制热轧态中第二相碳化物的尺寸，并在850～900 ℃淬火、约450 ℃回火是生产高硬度、高韧性51CrV4金刚石焊接锯片的关键工艺。

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	曾斌
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	李昭东
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	翁宇庆

关键词 ：金刚石焊接锯片, 51CrV4, 显微组织, 卷取温度, 热处理

Abstract：51CrV4 steel has excellent heat treatment performance and mechanical properties， thus it has been widely used as high-grade spring steel. To improve the properties of the existing saw blade steel， 51CrV4 steel was innovatively developed for manufacturing diamond welded saw blade matrix in this paper based on its unique chemical composition. By studying the dynamic CCT diagram， the effect of coiling temperature on the microstructure and the second phase precipitates， and the effect of quenching and tempering processes on carbide particle size， grain size and mechanical properties， the feasibility of 51CrV4 steel used for welded saw blade was discussed. The results show that， with the increase of coiling temperature， the size of proeutectoid ferrite grain and the lamellar spacing of pearlite become large， and the proportion of the (V， Cr) C particles whose size is below 10 nm reduces in the total amount of MC precipitate； Quenching temperature increases from 800 to 900 ℃， the austenite grain size changes slowly at first and then quickly grows up， and more and more carbide particles dissolve in the steel， the hardness of the saw blade after tempering also is enhanced， while tempering temperature increases from 450 to 550 ℃， the lamellar cementite locating at the boundary of martensite lath is gradually spheroidized， and the strength decreases obviously while the plasticity was slightly improved； By an optimized coiling temperature to control the size of second phase carbides together with quenching at 850-900 ℃ and tempering at about 450 ℃， the 51CrV4 weld diamond saw blade with high hardness and high toughness can be prepared.

收稿日期: 2015-06-08 出版日期: 2016-01-27

PACS:

TG142.45

引用本文:

曾斌，李昭东，孙新军，杨俊伟，雍岐龙. 新型锯片基体用钢51CrV4的研究与开发[J]. 钢铁, 2016, 51(2): 78-83. ZENG Bin，，LI Zhao-dong，SUN Xin-jun，YANG Jun-wei，YONG Qi-long. Research and development of 51CrV4 as a novel welded saw blade steel. Iron and Steel, 2016, 51(2): 78-83.

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