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首页> 外文期刊>Journal of Materials Engineering and Performance >Low-Temperature Fracture Toughness of a Heat-Treated Mild Steel
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Low-Temperature Fracture Toughness of a Heat-Treated Mild Steel

机译：低温断裂韧性耐热钢

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摘要

Specimens from a 0.14 percent C mild steel were austenitized at 1000 deg C for 1 h and thereafter furnace-cooled or isothermally transformed at 700 deg C for 0.5,2, and 8 h. The microconstituents present in the as-received material were ferrite and pearlite and their amounts did not substantially change even after heat treatment. The impact energy of the as-received and the furnace-cooled materials increased from 4 to 89 J and from 4 to 108 J, respectively, when the temperature was changed from -196 to 23 deg C. For these materials, the failure mode was by ductile fracture at 0 and 23 deg C and by quasicleavage fracture at -196 and -40 deg C. The fracture toughness did not show any significant change with isothermal transformation time at 700 deg C. The failure mode of the isothermally transformed materials was always by quasicleavage fracture.
机译：0.14％C温和钢的标本在1000℃下奥氏体化1小时，然后在700℃下在700℃下等温转化为0.5,2和8小时。 存在于接收物质中的微锁是铁氧体和珠光体，即使在热处理后，它们的量也没有显着变化。 当温度从-196至23℃变化时，所接收的接收和炉冷却材料的冲击能量分别从4到89 j和408 j增加到89 j和4至108 j。对于这些材料，失效模式是 通过在0和23℃下的韧性断裂和通过-196和-40℃的Quasicleavage骨折。断裂韧性在700℃下的等温转化时间没有显示出任何显着变化。始终是等温转化材料的失效模式 通过准裂缝骨折。

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