摘要
45钢常温淬火后应力较大,极易淬裂。采用亚温淬火工艺（淬火温度740、770和800℃）分析其淬火组织,后经不同温度回火,分析其强度、硬度以及冲击韧性等力学性能。结果表明：45钢在800℃淬火,其残留铁素体含量为6%~9%,呈极细小的颗粒状弥散分布,有利于其强韧性的提升;回火温度在340~460℃时,将获得较好的综合力学性能。选用合适的亚温淬火热处理工艺参数,其力学性能不逊于常温淬火,还能大大降低零件的淬裂倾向。
The 45 steel is easy to crack due to its high stress after normal temperature quenching. The quenching microstructure was analyzed by intercritical quenching at 740, 770, 800 ℃. After tempering at different temperatures,mechanical properties such as strength, hardness and impact toughness were analyzed. The results show that, when 45 steel is quenched at 800 ℃, the residual ferrite content is 6%-9%, and it is fine granular particle and distributes dispersively, which is beneficial to the improvement of the strength and toughness. When the tempering temperature is 340-460 ℃, good comprehensive mechanical properties can be obtained. The mechanical properties of samples with proper sub-temperature quenching are not inferior to those of samples with normal temperature quenching, and the cracking tendency of parts can be greatly reduced.
作者
应俊龙
张瑜
赵兴德
洪锋
YING Junlong, ZHANG Yu, ZHAO Xingde, HONG Feng(Changhe Aircraft Industries Corporation, Naviation Industry Group Company, Jingdezhen 330034, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第14期172-175,共4页
Hot Working Technology
关键词
亚温淬火
力学性能
常温淬火
淬裂倾向
intercritical quenching
mechanical properties
normal temperature quenching
quenching cracking tendency
