The effect of hot rolling process parameters on the microstructure, toughness and damage evolution of High Strength Low Alloy (HSLA) steels

Stelco Inc.是加拿大主要的钢铁生产商，对国民经济做出了重大贡献。高强度低合金（HSLA）钢是Stelco的重要产品，因为它在能源，基础设施，运输和农业部门的重要应用。Stelco和圭尔夫大学将研究Stelco通过不同的热轧工艺参数和钢的化学性质生产的许多不同的新型HSLA等级。本研究项目的目标是将HSLA微观结构特征（富碳相、分布、形貌、晶粒尺寸、夹杂物、析出物）对材料中观尺度损伤演化、大尺度断裂测试性能和最终韧性的影响联系起来。在这项研究工作中，我们将完成(1)钢的综合显微组织表征(2)在不同温度和应变速率下进行大规模断裂测试（Charpy V-Notch，单轴，落重撕裂试验）(3)进行数字图像相关的原位SEM测试(4)量化损伤演变并使用数据(5)验证先进的代表性体积元（RVE）微观组织有限元模型。该项目的成功实施将使Stelco能够更好地了解HSLA微观结构的设计，从而获得具有增强韧性的高性能材料。

Stelco Inc. is a major Canadian steel producer and significant contributor to the national economy. High Strength Low Alloy (HSLA) steel is an important product for Stelco due to its significant application within the energy, infrastructure, transportation, and agriculture sectors. Stelco and the University of Guelph will investigate a number of different and novel HSLA grades that Stelco produces by varying hot rolling process parameters and steel chemistry. The goal of this research project is to link the effect of HSLA microstructural characteristics (carbon-rich phases, distributions, morphology, grain size, inclusions, precipitates) on the meso-scale damage evolution, large-scale fracture test performance, and ultimately toughness of the material. In this research effort, we will complete a (1) comprehensive microstructural characterization of the steels (2) conduct large-scale fracture testing at various temperatures and strain-rate (Charpy V-Notch, Uniaxial, Drop Weight Tear Test) (3) conduct in-situ SEM testing with digital image correlation (4) quantify damage evolution and use the data to (5) validate advanced representative volume element (RVE) finite element models of the microstructures. The successful execution of this project will allow Stelco to better understand design an HSLA microstructure that will result in a high performance material with enhanced toughness.