论文部分内容阅读
YG15是WC-Co类硬质合金,其在钎焊过程中易发生脱碳反应.脱碳反应会生成脆性η相组织.此外,钎料中Zn含量过高也会导致脆性相的生成.对影响YG15与40Cr钎焊脆性相生成的因素进行了研究.研究发现焊接时间、焊后保温温度和保温时间对焊接强度影响较大.当保温温度过高或焊接时间过长时,由于焊缝中元素的扩散会导致偏析,特别Fe元素在焊缝界面聚集形成脆性的η相的部位.实验验证经过选择合适的保温温度和焊接时间(400℃温度保温8 h,焊接时间60 s)可以有效的抑制Zn脆性相的生产,得到良好的钎焊接头.
YG15 is a WC-Co-based cemented carbide that is prone to undergo decarburization during brazing. The decarburization reaction results in a brittle η phase structure. In addition, excessive Zn content in the brazing filler metal also results in the formation of brittle phases. The factors influencing the brittle phase of YG15 and 40Cr brazing were studied.The results show that welding time, post-weld holding temperature and holding time have great influence on the welding strength.When the holding temperature is too high or the welding time is too long, The diffusion of elements will lead to segregation, especially Fe element in the weld interface to form a brittle eta phase of the site.Experimental verification After selecting the appropriate holding temperature and welding time (400 ℃ temperature 8 h, welding time 60 s) can be effective Inhibit the production of Zn brittle phase, get a good brazed joints.