低碳微合金化含硼冷镦钢的冲击性能

通过对不同B含量的低碳硼钢和Nb、V微合金化低碳硼钢的冲击实验,研究了B含量及Nb、V微合金化对低碳硼钢冲击性能的影响. 结果表明:0.0006%～0.0015%的B将提高热处理状态钢的冲击韧性,B质量分数超过0.003%将降低钢的冲击韧性. Nb、V复合微合金化同时加入适量Al可显著提高热处理状态低碳硼钢的冲击韧性. Ti质量分数超过0.03%对低碳硼钢和微合金硼钢的冲击性能不利.

Impact property of micro-alloyed low carbon cold heading steel containing boron

The influences of B content and Nb,V micro-alloying on the impact toughness of low carbon boron steel were investigated by impact tests of low carbon boron steels with different boron contents and of Nb,V micro-alloyed low carbon boron steel.The results show that the B content of 0.000 6% to 0.001 5% can improve the impact toughness of the steel,but the B content more than 0.003% decreases the impact toughness.Nb,V micro-alloying with appropriate Al can increase the impact toughness of the steel,especially after heat treatment.It is disadvantageous that the Ti content is higher than 0.03% to the impact toughness of low carbon boron steel and micro-alloyed low carbon boron steel.