硬质合金与M42高速钢的激光钎焊组织及性能  

Laser brazing organization and properties of hard alloy and W2Mo9Cr4VCo8 high speed steel

作　　者：尚晓峰[1] 邓卫东[1] 王志坚[1,2] 李喆[1] 罗帅[1] 

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《激光与红外》2013年第12期1341-1344,共4页Laser & Infrared

基　　金：沈阳市科技计划项目"基于激光快速成形的复杂切削刀具绿色再制造技术研究"(No.F11-264-1-56)资助

摘　　要：硬质合金与高速钢的物化性能差异较大,利用高能激光束可有效实现硬质合金与高速钢的焊接。采用负离焦量△f=-3 mm,激光扫描速度过小(v<7 mm/s)、功率过大(P>1500 W)时母材中Co的大量散失而产生气孔和微裂纹等组织缺陷;速度过大(v>7 mm/s)、功率过小(P<1100 W)时钎料Cu与母材不能互溶,接头组织融合不良。选取v=7 mm/s、P=1100 W,钎焊接头形成等轴组织,性能良好,并测定其元素分布及显微维氏硬度。结果显示:母材中,除含Cu元素外,还有Co、Mo、Cr、Fe等元素分布,表明母材与钎料互溶性良好;接头组织及热影响区显微硬度变化最小,且平均显微硬度最大,分别为941.7 HV,778 HV。There exists a great difference between hard alloy and high speed steel in physical and chemical properties. The weld between hard alloy and high speed steel can be achieved effectively by using the high-energy laser beam. Using negative defocus amount △f =- 3mm,when laser scanning speed is too small（ v 7mm / s）,and power is too large（ P 1500W）,such tissue defects like the pores and micro cracks will be raised in base metal because of losing a large amount of Co. While laser scanning speed is too large（ v 7mm / s）,power is too small（ P 1500W）,Cu and base metal is immiscible,it will lead to the poor joint tissue fusion. So v = 7mm / s,P = 1100W,brazed joint forms equiaxed structure with good performance. Then tests about the distribution of its elements and micro- Vickers hardness are made. The result shows that： except Cu there also exists other elements such us Co,Mo,and Cr including in base metal,which indicates that base metal and solders are well fused. While the micro hardness of joint organization and heat affected zone changes smallest,the maximum average micro hardness of 941. 7HV and 778HV are obtained respectively.

关 键 词：激光钎焊 激光工艺参数 微观组织 EDS分析 显微硬度 

分 类 号：TN249[电子电信—物理电子学]