• CN:11-2187/TH
  • ISSN:0577-6686

›› 1999, Vol. 35 ›› Issue (6): 70-73,9.

• 论文 • 上一篇    下一篇

HQ130钢熔合区微裂纹扩展形态及断口特征

邹增大;李亚江   

  1. 山东工业大学
  • 发布日期:1999-11-01

CRACKING MORPHOLOGY AND FRACTURE CHARACTERISTICS IN THE FUSION ZONE OF HQI30 STEEL

Zou Zengda;Li Yajiang   

  1. Shandong University of Technology
  • Published:1999-11-01

摘要: 通过“铁研”、金相和扫描电镜(SEM)试验,对HQ130高强钢焊接熔合区微裂纹扩展和断口形貌特征进行了研究,试验结果表明,HQ130钢焊接裂纹大多起源于距熔化边界线20~60μm的半熔化区,一般是平行于熔合区扩展或是越过熔合区拐向焊缝中。裂纹扩展在焊缝区和半熔化区之间交替进行,并非严格按W/F界面破断。控制焊接线能量(≤20kJ/cm)可避免熔合区附近出现粗大的板条马氏体或上贝氏体,有利于防止焊接冷裂纹的产生和扩展。

关键词: HQ130高强钢, 断口形貌, 焊接熔合区, 微裂纹

Abstract: Cracking propagation and fracture morphology characteristics in the fusion zone of HQ130 high strength steel are studied by means of "the y-slit test", microscope and SEM. Experimental test indicated that welding crack commonly produced in the partially-melted zone at about 20μm-60μm from the melting line and propagated parallel to the fusion zone or turned into the weld metal. Crack propagation conducts alternatively between the weld zone and the partially-molten zone, and is not strictly to rupture at W/F boundary surface. Controlling weld heat input (≤20kJ/cm) may avoid forming coarse lath martensite or upper bainite nearby the fusion zone, and welding crack can be effectively prevented.

Key words: Fracture morphology, Fusion zone, HQ130 high strength steel, Micro-cracking

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