借助于热模拟、数值模拟的方法,采用添加铌、锰、铬、硼,不含钼的低成本合金设计,通过2种铌质量分数（0.09%和0.05%）钢种的对比,探讨了HTP工艺技术在厚度小于等于100mm、屈服强度大于等于600MPa级别高强度钢中的应用。试验结果表明：采用HTP＋回火工艺,可提高钢板的未再结晶温度;改善钢板厚度方向均匀性和钢板的心部冲击韧性,钢板表面和厚度1/4处的组织多为板条贝氏体组织,芯部组织为粒状贝氏体＋黑色的珠状组织。
With the help of thermo-mechanical simulation and numerical simulation,the application of HTP process in high strength steel（yield strength is no less than 600 MPa） with the thickness less than 100 mm was discussed,in which Nb,Mn,Cr and B were added and two Nb content（0.09% and 0.05%） steel were contrasted.The results show that by using HTP and temper process,non-recrystallization temperature of steel plate is increased,homogeneity and toughness at center of ultra-heavy plate is obviously increased.The microstructure is mainly lath-like bainite on surface and at quarter,and grain bainite and black pearl-like at center of the thickness by different cooling rate.
参考文献
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