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| Research and development of 51CrV4 as a novel welded saw blade steel |
| ZENG Bin1,2，LI Zhao-dong2，SUN Xin-jun2，YANG Jun-wei2，YONG Qi-long2 |
1. Technical Center，Lianyuan Iron and Steel Co.，Ltd.，Loudi 417009，Hunan， China
2. Department of Structural Steels，Central Iron and Steel Research Institute，Beijing 100081，China） |
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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.
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Received: 08 June 2015
Published: 27 January 2016
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2016, Vol. 51 
