上海第二工业大学学报
上海第二工業大學學報
상해제이공업대학학보
JOURNAL OF SHANGHAI SECOND POLYTECHNIC UNIVERSITY
2013年
1期
43-47
,共5页
低合金高强钢%准静态拉伸%高速拉伸%应变速率
低閤金高彊鋼%準靜態拉伸%高速拉伸%應變速率
저합금고강강%준정태랍신%고속랍신%응변속솔
HSLA steel%quasi-static tension%high speed tension%strain rate
针对HC340LA、HC420LA两种低合金高强钢,研究了准静态和高速拉伸时不同应变速率对其拉伸行为的影响.研究发现,低合金高强钢HC340LA在应变速率ε=5 s-1时,延伸率和抗拉强度分别比准静态下的相应数据增加67%和27.9%;而在应变速率ε=200 s-1时,延伸率和抗拉分别比准静态下的相应数据增加16.7%和25%.低合金高强钢HC420LA在应变速率ε=5 s-1时,延伸率和抗拉强度分别比准静态下的相应数据增加38.5%和16%;在应变速率ε=200 s-1时,延伸率和抗拉强度分别比准静态下的相应数据增加6.4%和18.34%.也就是说,与准静态拉伸相比,高速拉伸状态下的两种低合金高强钢材料具有更好的塑性、更高的抗拉强度和较高的屈强比,同时材料的塑性和抗拉强度随着应变速率的增加呈下降趋势,200 s-1以上的应变速率对低合金高强钢材料塑性的提高并没有多大贡献.
針對HC340LA、HC420LA兩種低閤金高彊鋼,研究瞭準靜態和高速拉伸時不同應變速率對其拉伸行為的影響.研究髮現,低閤金高彊鋼HC340LA在應變速率ε=5 s-1時,延伸率和抗拉彊度分彆比準靜態下的相應數據增加67%和27.9%;而在應變速率ε=200 s-1時,延伸率和抗拉分彆比準靜態下的相應數據增加16.7%和25%.低閤金高彊鋼HC420LA在應變速率ε=5 s-1時,延伸率和抗拉彊度分彆比準靜態下的相應數據增加38.5%和16%;在應變速率ε=200 s-1時,延伸率和抗拉彊度分彆比準靜態下的相應數據增加6.4%和18.34%.也就是說,與準靜態拉伸相比,高速拉伸狀態下的兩種低閤金高彊鋼材料具有更好的塑性、更高的抗拉彊度和較高的屈彊比,同時材料的塑性和抗拉彊度隨著應變速率的增加呈下降趨勢,200 s-1以上的應變速率對低閤金高彊鋼材料塑性的提高併沒有多大貢獻.
침대HC340LA、HC420LA량충저합금고강강,연구료준정태화고속랍신시불동응변속솔대기랍신행위적영향.연구발현,저합금고강강HC340LA재응변속솔ε=5 s-1시,연신솔화항랍강도분별비준정태하적상응수거증가67%화27.9%;이재응변속솔ε=200 s-1시,연신솔화항랍분별비준정태하적상응수거증가16.7%화25%.저합금고강강HC420LA재응변속솔ε=5 s-1시,연신솔화항랍강도분별비준정태하적상응수거증가38.5%화16%;재응변속솔ε=200 s-1시,연신솔화항랍강도분별비준정태하적상응수거증가6.4%화18.34%.야취시설,여준정태랍신상비,고속랍신상태하적량충저합금고강강재료구유경호적소성、경고적항랍강도화교고적굴강비,동시재료적소성화항랍강도수착응변속솔적증가정하강추세,200 s-1이상적응변속솔대저합금고강강재료소성적제고병몰유다대공헌.
@@@@The effect of strain rate on tensile behaviors of two high strength low alloys HC340LA and HC420LA during quasi-static and dynamic tension is studied. The research shows that the elongation increases by 67%and the tensile strength increases by 27.9%when the strain rate rises from 1×10-3 to 5 s-1, and the elongation increases by 16.7%and the tensile strength increases by 25%when the strain rate rises from 1×10-3 to 200 s-1 of the high strength low alloy HC340LA. And the elongation increases by 38.5%and the tensile strength increases by 16%when the strain rate rises from 1×10-3 to 5 s-1, and the elongation increases by 6.4%and the tensile strength increases by 18.34%when the strain rate rises from 1×10-3 to 200 s-1 of the high strength low alloy HC420LA. Better plasticity, higher tensile strength and yield ratio can be found in high speed tensile state than in quasi-static tension. The plasticity and tensile strength decrease with the increasing of the strain rate. The higher strain rate with over strain rate 200 s-1 has less contribution to the improvement of plasticity of the high strength low alloy steel.
