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研究了化学成分和热加工条件对中碳非调质钢棒材机械性能的影响。在1000～1250℃下加热后,950～1200℃下锻造,锻后以不同方式冷却。其结果为:(1)C,Mn,V,N均提高钢的强度,其中C,V影响最大。Mn在一定含量范围内对中碳非调质钢的塑性和韧性无不良影响,其余几元素均使之降低。(2)在同一冷却条件下,强度随加热温度的升高而提高,塑性和韧性则降低。(3)当终锻温度在1050—1150℃范围内变化时,钢的各项力学性能指标变化不明显。要想得到满意的塑性和韧性指标,降低终锻温度至950℃以下是必要的。(4)在800—600℃温度范围内,在较低冷却速度范围内,冷却速度愈快,强度愈高,塑韧性不变。
The effects of chemical composition and thermal processing conditions on the mechanical properties of non-quenched and tempered steel bars were investigated. Heated at 1000-1250 ° C, forged at 950-1200 ° C, cooled in different ways after forging. The results are as follows: (1) C, Mn, V and N both increase the strength of steel, among which C and V have the greatest influence. Mn in a certain range of content of carbon non-quenched and tempered steel plastic and toughness without adverse effects, the rest of the few elements are reduced. (2) Under the same cooling condition, the strength increases with the increase of the heating temperature while the plasticity and toughness decrease. (3) When the final forging temperature changes in the range of 1050-1150 ℃, the changes of various mechanical properties of the steel are not obvious. To be satisfied with the plasticity and toughness indicators, reducing the final forging temperature to below 950 ℃ is necessary. (4) In the 800-600 ℃ temperature range, in the lower cooling rate range, the faster the cooling rate, the higher the strength, the same plasticity and toughness.