期刊论文

中文

热加工工艺

1001-3814

2013

42

2

109-112

10.14158/j.cnki.1001-3814.2013.02.072

本校为第一机构

采用5 kW横流CO_2激光器,分别在常温空气冷却、冰水快速冷却条件下对304奥氏体不锈钢的上下表面进行熔凝试验,并对比分析其显微组织和拉伸力学性能。结果表明:经激光熔凝处理后,熔凝层组织形态由里及表依次为平面晶、胞状晶、树枝晶和等轴晶;组织明显得到细化,常温空气冷却和冰水快速冷却的熔凝层组织分别比基体组织细化约14倍和18倍;经两种不同的处理方式得到的试件,其拉伸力学性能均得到增强,且随熔凝层冷却速度的增加,相应的拉伸力学性能指标提高的幅度也增加。其中,经冰水快速冷却激光熔凝处理后的试件屈服强度、抗拉强度和伸长率分别可提高约22.4%、16.4%和15.7%.

The top surface and bottom surface of 304 austenitic stainless steel were melted using 5 kW continuous wave CO2 laser. The microstructure and tensile mechanical properties of laser melted layer cooled in room temperature air and cooled with ice water were compared. The research results show that the laser melting layer structure of the melted zone consists of plane crystal, cellular crystal, dendrite and equiaxed crystal from the bottom to the surface. The microstructure is obviously refined, microstructure of laser melted layer cooled in room temperature air and cooled in chilled water is ref...