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采用激光成形修复技术,以TC17锻件坯料为基体材料,以TC11粉末为熔覆材料,制备了TC17-TC11双合金试样,将其基材过热区宽度设计为5mm以研究修复过程中往复热循环和修复后退火热处理对试样组织的影响。结果表明,TC17基体因往复热循环作用,从底部到双合金界面处,温度逐渐升高到α/β相变点直至过热,随着初生α相的溶解和次生α相的析出,对应组织由双态组织向魏氏组织过渡,并且硬度逐渐上升。修复试样经500℃,1h/FC退火热处理后,次生α相更加细密均匀,试样过热区硬度较之沉积态提高了45%。
TC17-TC11 dual-alloy sample was prepared by TC11 powder as the base material and the width of overheat zone of the substrate was designed as 5mm to study the thermal cycling during the repair process And repair annealed annealing treatment on the sample organization. The results show that the temperature of TC17 matrix gradually increases from α / β transformation point to overheating at the interface from the bottom to the bimetallic interface due to the reciprocating thermal cycling. With the dissolution of primary α phase and the precipitation of secondary α phase, From the binary state organization to the Wei organization transition, and hardness gradually increased. After the samples were annealed at 500 ℃ for 1h / FC, the secondary α phases were more finely and uniformly distributed, and the hardness of the overheated zone was 45% higher than that of the as-deposited ones.