本文研究了硼对低碳低合金钢经(α+γ)区加热形成的奥氏体的淬透性的影响。结果表明,增加硼含量(从0.0005到0.0029％),将减少亚温区加热时形成的奥氏体含量。但明显增加了奥氏体的淬透性,并且降低了马氏体含量及钢的拉伸性能对冷却速度变化的敏感性。同位素示踪分析表明,在亚温区加热时,硼原子仍明显分布在原正火态奥氏体晶界上,没有见到硼原子向α/γ相界的迁移和偏聚。
The effects of boron on the hardenability of austenite in dual-phasesteel and on the tensile properties have been studied. With the increase of B con-tent from 0.0005 to 0.0029 wt-%, the volume fraction of the austenite decreases atconstant intercritical annealing temperature, the hardenability of the austenite inc-reases remarkably, as well as the martensite content and the sensitivity of tensile pro-perties to cooling rate decrease. It was observed by using isotopic tracing autora-diography that after intercritical annealing, the B atoms segragate at the grainboundaries of austenite produced during normalization, no evidence of the migrationof B atoms to α/γ interfaces was found.
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