超高强钢断后伸长率检测稳定性的影响因素分析  

Influencing factors analysis on the detection stability of elongation after fracture for ultra-high strength steel

作　　者：蔡红梅 李季 侯永亮[1] 杨玉倩 苗正 CAI Hongmei;LI Ji;HOU Yongliang;YANG Yuqian;MIAO Zheng(Shougang Jingtang Linited Iron&Steel Co.,Ltd.,Tangshan 063200,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司,河北唐山063200

出　　处：《物理测试》2025年第1期10-13,共4页Physics Examination and Testing

摘　　要：通过对比线切割、冲切加工、激光切割这3种不同制样工艺所得加工面的试样组织,以及断后伸长率的稳定性,筛选出最适宜超高强钢的制样工艺。依据标准要求,分析了3种不同过渡弧半径对超高强钢断后伸长率检测稳定性的影响,以及3个不同速率转换点参数设置对其稳定性的作用。同时,对激光引伸计和机械式引伸计测量超高强钢断后伸长率的检测稳定性展开对比。基于上述研究,就实验室检测超高强钢断后伸长率提出建议:制样方法推荐采用激光切割;过渡弧半径选取35 mm;速率转换点参数设置为0.10或0.15时,数据最为稳定;若采用自动测量超高强钢断后伸长率,激光引伸计相较于机械式引伸计,所获数据更具稳定性。By comparing specimen microstructure of the processed surfaces obtained by the three different sample preparation processes,i.e.,wire cutting,punching processing,and laser cutting,as well as the stability of elongation after fracture,the most suitable sample preparation process for ultra-high strength steel was screened out.According to standard requirements,the influences of three different transition arc radii on the detection stability of elongation after fracture for ultra-high strength steel were analyzed.Moreover,the influences of three different rate switching point parameter settings on the stability were also investigated.At the same time,the stabilities of measured elongation after fracture for ultra-high strength steel by laser extensometer and mechanical extensometer were compared.Based on the above research,the suggestions for detection of the elongation after fracture of ultra-high strength steel in the laboratory were put forward:laser cutting was recommended for sample preparation;the transition arc radius was selected as 35 mm;when the rate switching point parameter was set to 0.10 or 0.15,the data were most stable;if the elongation after fracture of ultra-high strength steel was automatically measured,the data obtained by laser extensometer were more stable than those obtained by mechanical extensometer.

关 键 词：超高强钢 断后伸长率 稳定性 激光引伸计 机械式引伸计 

分 类 号：TG142.1[一般工业技术—材料科学与工程]