激光熔覆高温合金及其应用

高温工模具的失效方式主要为工作面的热磨损和氧化热疲劳。针对这一特点，选用镍基高温合金＋ＷＣ和ＭＣｒＡＩＹ合金（Ｍ＝Ｎｉ，Ｃｏ）＋ＷＣ进行激光熔覆试验，并对激光熔覆层进行组织性能测试。结果表明，镍基高温合金＋ＷＣ有较高的热强性，而ＭＣｒＡＩＹ＋ＷＣ则有较佳的抗氧化性。将两类合金激光熔覆层应用于无缝钢管顶头上提高使用寿命１～４倍。其中以ＭＣｒＡＩＹ合金＋１０％ＷＣ激光熔覆顶头寿命最长。

Laser Cladding of High Temperature Alloys and Their Application

Failure of the high temperature tools includes mainly hot-wearing, oxidizing and hot-fatigue. According to this character, Ni-based high temperature alloy + WC and MCrAlY alloy (M=Ni, Co) + WC are coated on the steel substrate by laser cladding. The observation of microstructure and mechanical perfomance of the claddings have been carried out. The results show that the coatings of Ni-based high temperature alloy + WC have a higher hot strength-hardness than that of MCrAlY alloy + WC, but the latter has better oxidation resistance than that of Ni-based igh temperature alloy +WC. The above two classes of coatings are applied to the seamless tube plugs, as a result, the service life of the plugs has been improved by 1~4 times. Among the coatings, the MCrAlY alloy +10% WC is the best.