【摘要】 针对0Cr11Ni2MoVNb钢大型锻件冷却速率慢的特点,研究了不同预冷淬火温度、不同淬火和回火冷却速率对材料冲击韧度和组织的影响。结果表明:随着淬火和回火冷却速率的减慢,材料的冲击韧度下降;为了提高0Cr11Ni2MoVNb钢大型锻件的冲击韧度,可以采用预冷淬火或者淬火和回火同时快冷(冷速约60℃／min)的工艺,但预冷淬火温度应不低于900℃,否则晶界析出物将增多,沿晶断裂增加,导致冲击韧度明显下降。更多还原

【Abstract】 Considering the slow cooling speeds of 0Cr11Ni2MoVNb big forge piece, the effects of different delayed quenching temperatures and different cooling speed of quench and temper on the impact toughness and microstructure were investigated. The impact toughness decreased with decreasing the cooling speed of quench and temper. In order to increase the impact toughness of big forge piece, the best way is to adopt the delayed quenching or fast cooling speed (about 60℃/min) for quench and temper at the same time . However, when the delayed quenching is adopted, the delayed quenching temperature should be higher than 900℃; otherwise, the amount of precipitates increases, which leads to more intergranular fracture and decreases the impact toughness.更多还原