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Stelco是北美顶级钢铁生产商之一，该生产商在该大陆上运营着最现代的绿色钢结构制造设施。 Stelco最近重新建立了作为一个独立的加拿大公司，雇用了2200多名人员，并为汽车，能源和建筑部门生产了各种钢。客户使用材料来构建车辆撞击壁垒（护栏）。在低温下符合补充滴量体重撕裂测试（DWTT）规格所需的材料。该线圈是使用550度的连接温度产生的，但不符合DWTT规范，并导致Stelco损失。 Asecond线圈是使用围绕的温度达到500摄氏度的，该温度满足DWTT规范，但结果混合了。盘绕温度对（i）微结构（II）低温DWTTTTPerformane（II）和（iii）零星DWTT结果对该级HSLA钢的结果尚不清楚，并构成了拟议的研究的基础。高分辨率光学和场发射扫描电子显微镜将用于量化盘绕温度对经测试的HSLA材料的微结构和损伤演化的影响。结果将为Stelco洞悉HSLA（和类似）钢等级的盘绕温度DWTT性能的影响，并通过减少Stelco所面临的其他问题与DWTT测试本身有关（以及如何测试参数（测试参数）优惠券，缺口类型，测试能量和剪切测量）会影响结果。一项参数DWTT研究将在Stelco的研发设施中进行，以更好地了解测试并标准化其测试程序。