A Microstructural and Damage Investigation into the Low Temperature Drop Weight Tear Test (DWTT) Behavior of an HSLA Steel

HSLA 钢低温落锤撕裂试验 (DWTT) 行为的微观结构和损伤研究

• 批准号: 515201-2017
• 负责人: Bardelcik, Alexander
• 金额: $ 1.82万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639993
• 关键词: Microstructural; Damage; Investigation; into; Low

Stelco Canada is one of the top steel producers in North America, which operates the most modern greenfieldintegrated steel making facility on the continent. Recently re-established as an independent Canadiancompany, Stelco employs more than 2,200 personnel and produces a variety of steels for the automotive,energy and construction sectors.Recently, Stelco produced a hot rolled coil of a High Strength Low Alloy (HSLA) steel for a customer thatintended to use the material to construct vehicle impact barriers (guard rails). The material needed to meet ademanding Drop Weight Tear Test (DWTT) specification at low temperatures. The coil was produced using acoiling temperature of 550 degC, but did not meet the DWTT specification and resulted in a loss for Stelco. Asecond coil was produced using a coiling temperature to 500 degC, which met the DWTT specification, butwith mixed results. The effect of the coiling temperature on the (i) microstructure (ii) low temperature DWTTperformance and (iii) sporadic DWTT results for this grade of HSLA steel is not well understood, and formsthe basis of the proposed research. High resolution optical and field emission scanning electron microscopywill be used to quantify the effect of coiling temperature on the microstructure and damage evolution for theDWTT tested HSLA materials. The results will provide Stelco insight into the effect of coiling temperature onlow temperature DWTT performance of HSLA (and similar) steel grades and benefit the company by reducingcustomer coil rejections.Another problem faced by Stelco is associated with the DWTT test itself and how testing parameters (couponthickness, notch type, test energy and shear measurement) affect the results. A parametric DWTT study will beconducted at Stelco's R&D facility to better understand the test and standardize their testing procedure.

加拿大斯特尔科是北美最大的钢铁生产商之一，它运营着非洲大陆最现代化的绿地综合炼钢设施。最近，Stelco作为一家独立的加拿大公司重新成立，拥有2200多名员工，生产用于汽车、能源和建筑行业的各种钢材。最近，Stelco为一家客户生产了一种高强度低合金(HSLA)钢的热轧卷材，打算使用这种材料来建造车辆防撞护栏(护栏)。该材料需要在低温下满足规定的跌落重量撕裂试验(DWTT)规范。该线圈是在550摄氏度的烘烤温度下生产的，但不符合DWTT规范，导致Stelco损失。使用500℃的卷取温度生产第二个线圈，该线圈符合DWTT规范，但结果喜忧参半。卷取温度对(I)组织、(Ii)低温DWTT性能和(Iii)该等级HSLA钢的零星DWTT结果的影响尚不清楚，这构成了所提出的研究的基础。高分辨光学和场发射扫描电子显微镜将被用来量化卷绕温度对DWTT测试的HSLA材料的微观结构和损伤演化的影响。这些结果将使Stelco深入了解卷取温度对HSLA(和类似)钢种的低温DWTT性能的影响，并通过减少客户线圈废品率而使公司受益。Stelco面临的另一个问题与DWTT测试本身以及测试参数(对接厚度、缺口类型、测试能量和剪切测量)如何影响结果有关。将在Stelco的研发机构进行参数DWTT研究，以更好地了解测试并使其测试程序标准化。