1. Technology Operations Section， Center Iron and Steel Research Institute， Beijing 100081， China 2. School of Mechanical， Electronic and Control Engineering， Beijing Jiaotong University， Beijing 100044， China 3. Development Department， Shijiazhuang Iron and Steel Co.， Ltd.， Shijiazhuang 050031， Hebei， China
Abstract：The microstructure characteristics especially the distribution， morphology and particle size of vanadium carbonitride precipitates in hot-forged medium-carbon micro-alloyed steel for fracture splitting connecting rod with two different vanadium contents (0.15 %， 0.28 %) were examined by OP， TEM and XRD， and their precipitation behavior were analyzed. The results reveal that both the volume fraction of ferrite and the amount of V-rich M(C，N) particles increase， the pearlite interlamellar spacing decreases with increased V content. Further the physical-chemical phase analysis shows that about 48 % and 64 % V of the total in the steel are tied up in the M(C，N) precipitates of the two tested steels， respectively. Meanwhile， the mass percent of fine particles (less than 10 nm) in the two steels is about 42.6 % and 56.7 %， respectively， and the corresponding yield strength increments are 140.0 and 232.6 MPa. It’s concluded that medium-carbon steel with higher V content possesses not only has comparable tensile strength and impact energy absorbed with that of conventional steel C70S6 for fracture splitting connecting rod， but also has much higher yield strength and yield strength ratio， and therefore， is more suitable to fabricate high performance fracture splitting connecting rod.
收稿日期: 2014-09-02
出版日期: 2015-07-06
引用本文:
陈思联，赵晓丽，惠卫军，戴观文，董 瀚. 胀断连杆用中碳非调质钢的析出强化行为[J]. 钢铁, 2015, 50(7): 77-83.
CHEN Si-lian，ZHAO Xiao-li，HUI Wei-jun，DAI Guan-wen，DONG Han. Precipitation behavior of medium-carbon steel for fracture splitting connecting rod. Iron and Steel, 2015, 50(7): 77-83.
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2015, Vol. 50 
