Scholarlink

<p>The laser-welded joint of 2000&#xa0;MPa cold-rolled annealed hot-pressed steel (PHS) was easy to break during cold rolling. In this study, laser butt welding was performed on four types of PHS2000 hot-rolled steel plates, containing 0% Nb, 0.04% Nb, 0.06% Nb + Cr, and 0.08% Nb + Cr. Then, the welded plates were subjected to cold rolling. The results showed that the heat-affected zone underwent varying bending degrees and stress concentration after cold rolling. Adding 0.04% Nb, no cracks appeared on the weld surface. Both hardness and tensile strength showed a positive correlation with the reduction rate. The hardness of chromium-containing steel increased with cold rolling, but decreased after a 40% reduction. The cracking at the weld edge after cold rolling was caused by the significant hardness difference between the fully quenched zone and the base material. Adding 0.04% Nb can reduce this difference, effectively preventing crack formation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Cold Rolling on the Microstructure and Properties of Laser-Welded PHS Alloy Steel

  • 期刊论文

  • 发表日期：

    2025年7月3日

查看全文
  • Bo Li,
  • Famin Cong,
  • Chunzhi Xia,
  • Chengxiang He,
  • Xiangping Xu

摘要

The laser-welded joint of 2000 MPa cold-rolled annealed hot-pressed steel (PHS) was easy to break during cold rolling. In this study, laser butt welding was performed on four types of PHS2000 hot-rolled steel plates, containing 0% Nb, 0.04% Nb, 0.06% Nb + Cr, and 0.08% Nb + Cr. Then, the welded plates were subjected to cold rolling. The results showed that the heat-affected zone underwent varying bending degrees and stress concentration after cold rolling. Adding 0.04% Nb, no cracks appeared on the weld surface. Both hardness and tensile strength showed a positive correlation with the reduction rate. The hardness of chromium-containing steel increased with cold rolling, but decreased after a 40% reduction. The cracking at the weld edge after cold rolling was caused by the significant hardness difference between the fully quenched zone and the base material. Adding 0.04% Nb can reduce this difference, effectively preventing crack formation.