以TCS345铁素体不锈钢名义熔合线处的缺口冲击韧度为研究对象,采用一次回归正交试验,考察脉冲熔化极气体保护焊(pulse gas metal arc welding简称GMAW-P)脉冲工艺参数对名义熔合线处缺口冲击韧度的影响,分析脉冲电流、脉冲时间、脉冲频...以TCS345铁素体不锈钢名义熔合线处的缺口冲击韧度为研究对象,采用一次回归正交试验,考察脉冲熔化极气体保护焊(pulse gas metal arc welding简称GMAW-P)脉冲工艺参数对名义熔合线处缺口冲击韧度的影响,分析脉冲电流、脉冲时间、脉冲频率、焊接速度及其交互作用对焊接接头名义熔合线缺口冲击韧度的影响规律.结果表明,TCS不锈钢焊接热影响区的组织为铁素体+马氏体.运用MATLAB优化函数对焊接工艺参数进行优化,优化结果为脉冲电流450A、脉冲时间2.3ms、脉冲频率250Hz、焊接速度500mm/min.展开更多
To determine the toughness of materials, Charpy V notch test has been widely used over the world. Originally, the Charpy-V or U tests were used mainly as a quality control tests. In this paper, effects of temperature ...To determine the toughness of materials, Charpy V notch test has been widely used over the world. Originally, the Charpy-V or U tests were used mainly as a quality control tests. In this paper, effects of temperature and notch geometry on variation of toughness/yield stress ratio were investigated. The experimental work has been performed on austenitic stainless steel 316L using Charpy tests and carried out at temperature range from 20 ℃ to 250 ℃ on different dimension of V- and U-notch specimens. Energy of fracture was determined directly from machine tests. Furthermore, Barsoum correlation has been applied to determine toughness/yield stress ratio as function of temperature. In addition, several parameters were investigated namely specimen thickness and notch cut angles. U-notch specimen offers a high resistance comparatively to the V-notch and that toughness depends on temper situation and orientation of notch relative to the rolling direction.展开更多
文摘以TCS345铁素体不锈钢名义熔合线处的缺口冲击韧度为研究对象,采用一次回归正交试验,考察脉冲熔化极气体保护焊(pulse gas metal arc welding简称GMAW-P)脉冲工艺参数对名义熔合线处缺口冲击韧度的影响,分析脉冲电流、脉冲时间、脉冲频率、焊接速度及其交互作用对焊接接头名义熔合线缺口冲击韧度的影响规律.结果表明,TCS不锈钢焊接热影响区的组织为铁素体+马氏体.运用MATLAB优化函数对焊接工艺参数进行优化,优化结果为脉冲电流450A、脉冲时间2.3ms、脉冲频率250Hz、焊接速度500mm/min.
文摘To determine the toughness of materials, Charpy V notch test has been widely used over the world. Originally, the Charpy-V or U tests were used mainly as a quality control tests. In this paper, effects of temperature and notch geometry on variation of toughness/yield stress ratio were investigated. The experimental work has been performed on austenitic stainless steel 316L using Charpy tests and carried out at temperature range from 20 ℃ to 250 ℃ on different dimension of V- and U-notch specimens. Energy of fracture was determined directly from machine tests. Furthermore, Barsoum correlation has been applied to determine toughness/yield stress ratio as function of temperature. In addition, several parameters were investigated namely specimen thickness and notch cut angles. U-notch specimen offers a high resistance comparatively to the V-notch and that toughness depends on temper situation and orientation of notch relative to the rolling direction.
