爆炸焊接結(jié)構(gòu)鋼-不銹鋼復(fù)合板界面的微觀缺陷

爆炸焊接結(jié)構(gòu)鋼-不銹鋼復(fù)合板界面的微觀缺陷Microscopic Defect at Interface of Explosion-Welded Structural Steel-Stainless Steel Composite Plate

以Q235A低碳鋼，16Mn、15MnVN低合金鋼等3種結(jié)構(gòu)鋼為基板，以304不銹鋼為覆板，采用爆炸焊接方法制備了結(jié)構(gòu)鋼-不銹鋼復(fù)合板，利用超聲波探傷、掃描電鏡觀察、能譜檢測等分析了結(jié)合界面處的微觀缺陷。結(jié)果表明：爆炸焊接復(fù)合板界面處存在空洞和微縫隙缺陷，這些缺陷不能通過熱軋消除；空洞處的主要成分為鐵元素，與原始鋼板的成分有較大差異；當(dāng)爆速增大、基板材料塑性降低時，復(fù)合板界面區(qū)的微裂紋率會增加；熱軋后，復(fù)合板界面的局部區(qū)域出現(xiàn)夾層缺陷，夾層缺陷位于覆板一側(cè)，其成分與基板的相近。

With three structural steels of Q235A low carbon steel, 16Mn and 15MnVN low-alloy steels, respectively, as a basal plate and 304 stainless steel as a shroud plate, the structural steel-stainless steel composite plates were prepared by explosion welding. The microscopic defects at the bonding interface were investigated by ultrasonic flaw detection, scanning electron microscopy, energy dispersive spectrometer, etc. The results show that the holes and the microgaps existed at the interface of explosion-welded composite plates, which can't be eliminated by hot-rolling. The main element was iron in the holes and the composition was much different from that of raw steel plate. The microcrack ratio in the interface of the explosion-welded composite plate increased with the increase of the explosion speed or the reduction of the plasticity of the basal plate. After hot-rolling, some sandwich defects were found in the local interface of the composite plate, which were on the side of the shroud plate and with nearly the same composition as the basal plate.

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