35CrMoA钢的热处理工艺试验
Trial Heat Treatment Processes for 35CrMoA Steel
金帅 1王会强 1赵建新 2闫学兰 3崔建英 4郭超 5李文翔6
作者信息
- 1. 河北农业大学机电工程学院,河北保定 071066
- 2. 保定市东利机械制造股份有限公司,河北保定 071100
- 3. 保定金阳光能源装备科技有限公司,河北 保定 071000
- 4. 巨力索具股份有限公司,河北 保定 072550
- 5. 河北凯恩机电设备有限公司,河北保定 072450
- 6. 馆陶县飞翔机械装备制造有限公司,河北邯郸 057750
- 折叠
摘要
为满足力学性能要求,对φ125 mm的35CrMoA钢试棒进行了四种工艺的热处理,包括正火加亚温淬火、退火加亚温淬火和亚温淬火后于650～570 ℃回火.检测了热处理后钢的拉伸性能,-20℃、-35 ℃、-45℃冲击韧度,冲击试样的断口形貌,硬度和显微组织.结果表明:经840 ℃退火、810 ℃亚温淬火和570 ℃回火的35CrMoA钢力学性能性能满足要求;亚温淬火能使35CrMoA钢获得良好的低温冲击韧度;亚温淬火后回火温度从650℃降到570 ℃,钢的低温冲击韧度、断后伸长率和断面收缩率下降,强度提高;经不同工艺热处理的35CrMoA钢显微组织为回火索氏体和铁素体.
Abstract
In order to meet mechanical property requirements,the 125-mm-diam 35CrMoA steel test bars were heat treated by four types of procedure,among which are:annealing plus sub-critical quenching,normalizing plus sub-critical quenching,and tempering at temperatures varying from 650 to 570 ℃ subsequent to sub-critical quenching.After heat treating,the steel was tested for tensile properties,impact toughnesses at-20 ℃,-35 ℃ and-45 ℃,morphology of impact specimen fracture,hardness,and microstructure.The results indicated that(a)the 35CrMoA steel subjected to annealing at 840 ℃,sub-critical quenching from 810 ℃ and tempering at 570 ℃ exhibited mechanical properties which met the requirements;(b)the sub-critical quenching was able to cause 35CrMoA steel to have good low-temperature impact toughness;(c)with the decrease in tempering temperature after sub-critical quenching from 650 to 570 ℃,the steel decreased in low-temperature impact toughness,elongation and area reduction,and increased in strengths;and(d)the microstructure of the 35CrMoA steel heat treated by the different procedures consisted of tempered sorbite and ferrite.
关键词
35CrMoA钢/低温冲击韧度/回火温度/显微组织Key words
35CrMoA steel/low-temperature impact toughness/tempering temperature/microstructure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据