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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。
By means of thermal simulation and numerical simulation, a low-cost alloy with addition of niobium, manganese, chromium, boron and molybdenum was designed. By comparing the two types of niobium (0.09% and 0.05%), Process technology in the thickness of less than or equal to 100mm, yield strength greater than or equal to 600MPa grade high strength steel applications. The results show that: the use of HTP + tempering process can increase the non-recrystallization temperature of the steel sheet; to improve the uniformity of the thickness direction of the steel plate and the heart of the impact toughness, the surface of the steel and the thickness of 1/4 of the organization mostly lath bainite Tissue, the core organization of granular bainite + black beads.