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首页> 外文期刊>Materials Science and Engineering >Mechanical property development of a 0.15C-6Mn-2Al-1Si third-generation advanced high strength steel using continuous galvanizing heat treatments
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Mechanical property development of a 0.15C-6Mn-2Al-1Si third-generation advanced high strength steel using continuous galvanizing heat treatments

机译：连续镀锌热处理开发的0.15C-6Mn-2Al-1Si第三代高强度高强度钢的力学性能

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摘要

The effects of starting microstructure and intercritical annealing (IA) temperature on the mechanical properties of a prototype 0.15C-6Mn-1.5Al-1Si (wt%) third-generation medium manganese advanced high strength steel (3G AHSS) were determined. The general 3G AHSS mechanical property targets UTS × TE of 24,000-40,000 MPa % were met after a continuous galvanizing line (CGL)-compatible IA treatments at 710 ℃ and 740 ℃ for 120 s from an 80% martensite - 20% ferrite starting microstructure due to the as-annealed microstructure having large volume fractions of stable retained austenite. The deformation-induced retained austenite to martensite transformation - or TRansformation-induced plasticity (TRIP) - kinetics were a strong function of IA temperature and resulting retained austenite stability. In particular, the 665 ℃ intercritical anneal produced retained austenite which only partially transformed during deformation and the 740 ℃ intercritical anneal produced retained austenite which exhausted the TRIP effect at significantly lower strains than those observed for the 710 ℃ treatment. It was also shown that significant deformation-induced mechanical twinning occurred in the retained austenite, aiding in sustaining the work hardening rate. Overall, it was determined that medium-Mn 3G AHSS can be produced using CGL-compatible thermal cycles, which holds promise for cost-effective production of these alloys.
机译：确定了起始组织和临界退火温度对原型0.15C-6Mn-1.5Al-1Si（wt％）第三代中锰高强度高强度钢（3G AHSS）的力学性能的影响。在80％马氏体-20％铁素体初始组织下，在710℃和740℃下连续镀锌线（IA）在710℃和740℃下处理120 s后，达到了24,000-40,000 MPa％的3G AHSS一般机械性能目标UTS×TE。由于退火后的微观结构具有大体积分数的稳定残留奥氏体。形变诱导的残余奥氏体向马氏体转变-或相变诱导的可塑性（TRIP）-动力学是IA温度的强函数，并导致了残余奥氏体的稳定性。特别是，665℃临界退火产生的残余奥氏体在变形过程中仅部分转变，而740℃临界退火产生的残余奥氏体在比710℃处理观察到的应变低得多的应变下具有TRIP效应。还显示出，在残余奥氏体中发生了明显的由变形引起的机械孪晶，有助于维持加工硬化率。总体而言，已确定可以使用与CGL兼容的热循环来生产中锰3G AHSS，这有望以经济高效的方式生产这些合金。

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