Effect of Heat Treatment Temperature on Properties of Vanadium and Titanium Modified Automobile Transmission Shaft Steel

The vanadium and titanium modified automobile transmission shaft steels were heat treated with various normalizing temperatures,quenching temperatures and tempering temperatures. The impact property and wear resistance were tested and analyzed. The results show that both of the impact property and wear resistance of the steel first increase and then decrease,with increase of normalizing temperature from 800 ℃ to 880 ℃,or quenching temperature from 790 ℃ to 870 ℃,or tempering temperature from 520 ℃ to 600 ℃.The optimized normalizing temperature,quenching temperature and tempering temperature are 860 ℃,850 ℃ and 580 ℃,respectively.