激光淬火后Cr12MoV钢渗硼层界面形貌与能谱分析  

Interface morphology and energy spectrum analysis of boronized layer Cr12Mo V steel after laser quenching

作　　者：谢春洋[1] 孔德军[1,2] 

机构地区：[1]常州大学机械工程学院,江苏常州213164 [2]江苏省材料表面科学与技术重点实验室常州大学,江苏常州213164

出　　处：《材料热处理学报》2015年第4期200-205,共6页Transactions of Materials and Heat Treatment

基　　金：江苏省科技支撑计划(工业)(BE20140818);中国学位与研究生教育学会研究课题(C1-2013Y07-051)

摘　　要：利用热浸渗法对Cr12Mo V冷作模具钢进行渗硼处理,通过激光淬火对渗硼层进行了强化处理,用SEM、EDS、XRD对渗硼层表面-界面形貌、化学元素分布和物相进行表征,分析了激光淬火对渗硼层组织和性能的影响。结果表明,激光淬火后Cr12Mo V钢渗硼层表面孔洞减少,降低了剥落的可能性;激光淬火后渗硼层产生了Fe-Cr化合物和Fe2B新相,仍以Fe B相为主,有利于减少渗硼层脆性;元素未发生大量扩散,富碳层仍然存在,但组织得到细化,韧性和强度有所提高;激光淬火时孔洞中Si元素溶于奥氏体中,分布更均匀,Cr与Fe结合增强了渗硼层结合强度。Cr12Mo V cold worked die steel was boronized with hot dip method,which was strengthened with laser quenching( LQ),the surface and interface morphology,composition of chemical elements and phases of the layer were characterized by SEM,EDS and XRD,respectively. The results show that the gaps of boronized layer after LQ decrease to reduce the flaking chance. The new phase of Fe2 B and Fe-Cr compound are produced after LQ in the boronized layer,but mainly composed of Fe B,which decreased brittleness of boronized layer. The element diffusion is not obvious and rich carbon zone is still existed,and its toughness and strength get improved by a finer microstructure. Si atom of the gaps can dissolve into austenite with uniform distribution after LQ,and the combining of Cr and Fe enhances bonding strength of boronized layer.

关 键 词：Cr12Mo V钢 渗硼层 激光淬火 结合界面 线扫描 面扫描 

分 类 号：TG156.87[金属学及工艺—热处理] TG156.99[金属学及工艺—金属学]