Effect of alloying elements on fracture toughness KIc of vacuum heat treated spring steel 51CrV4
For the manufacture of leaf springs 51CrV4 spring steel is commonly used. Since in the automotive industry ongoing trend to reduce weight of components is present, spring steels with extraordinary mechanical properties are required. Among these fracture toughness KIc is especially important, providing the desired high endurance. In this work several heats of spring steel with different addition of alloying elements Nb, Mo, C, Al and Ca were investigated in terms of fracture toughness KIc and Rockwell-C hardness.The non-standard testing method using circumferentially notched and fatigue-precracked tensile specimens was used to measure fracture toughness KIc and investigate the influence of alloying elements on fracture toughness and Rockwell-C hardness of vacuum heat-treated spring steel. The results are presented in the form of tempering diagrams, showing the effect of tempering temperature on the fracture toughness vs. Rockwell-C hardness ratio (KIc/ HRc) and hardness HRc for different batch of spring steel.Results of this investigation show that by microalloying conventional 51CrV4 spring steel with different alloying elements (Nb, Al, Ca, Mo and C) fracture toughness KIc can be increased for up to 10％ while maintaining the same hardness level.. Equal or greater ductility and fracture toughness of high strength springs enables the manufacturer to reduce the weight of the springs, while increasing their endurance during exploitation.
fracture toughness spring steel alloying elements tempering diagrams
Bojan Sencic Vojteh Leskovsek Bojan Podgornik
STORE STEEL d.o.o., Zelezarska cesta 3, Store, Slovenia Jozef Stefan International Postgraduate Scho Institute of metals and technology, Lepi pot 11, Ljubljana, Slovenia
国际会议
北京
英文
128-131
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）