摘要
研究了二次硬化钢 2 5Cr3Mo3NiNb的冲击韧度随回火温度和试验温度的变化。结果发现 ,试验钢在2 0 0℃回火时冲击韧度较高 ,30 0～ 60 0℃回火时冲击韧度值较低 ,60 0℃以上回火时冲击韧度值迅速升高 ,640℃回火时冲击韧度达到最高值 5 5J/cm2 ,640℃以上回火时冲击韧度值有所降低。 640℃回火后试验钢的冷脆转变温度为 10℃ ,屈服强度为 960MPa ,可以满足兵器特种结构件高强度高韧性的要求。
The variations of impact toughness with tempering temperature and test temperature for secondary hardening steel 25Cr3Mo3NiNb were studied.It is found that the experimental steel has a relatively higher impact toughness when tempered at 200℃,then a lower impact toughness at 300～600℃,and a peak impact toughness of 55J/cm2 at 640℃.In addition,when tempered at 640℃,the ductile-brittle transition temperature(DBTT)is about 10℃ and the yield strength reachs to 960MPa.The combination of high strength and impact toughness of the steel makes it suitable for producing some important parts used in ordnance industry.
出处
《金属热处理》
CAS
CSCD
北大核心
2003年第3期14-17,共4页
Heat Treatment of Metals
关键词
二次硬化钢
冲击韧度
冷脆转变
secondary hardening steel
impact toughness
ductile-brittle transition
