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为了研究低温对超高强度钢断裂行为的影响,采用37SiMnCrNiMoV钢的表面予裂板状试件,经正常热处理(930℃,15分,油淬,280℃回火)后,在-196～20℃的温度范围内进行试验。随温度的变化,其断裂韧度值由85kgf·mm~(3/2)(-196℃)变到195·7kgf·mm~_(3/2)(20℃),而试样平断口区域中准解理刻面的百分数由100％(-196℃)变到15％(20℃)。本文指出了超高强度钢与低碳钢冷脆行为的差异并进行了讨论。本工作中还研究了奥氏体化保温时间,含碳量和低温回火脆性对超高强度钢低温断裂行为的影响。
In order to study the influence of low temperature on the fracture behavior of ultra-high strength steel, the surface rupture plate specimen of 37SiMnCrNiMoV steel was subjected to normal heat treatment (930 ℃, 15 min, oil quenching, tempering at 280 ℃) ℃ temperature range of the test. The fracture toughness value changes from 85kgf · mm ~ (3/2) (-196 ℃) to 195.7kgf · mm ~ (3/2) (20 ℃) with the change of temperature, The percentage of quasi-cleaved facets changed from 100% (-196 ° C) to 15% (20 ° C). This paper points out the differences in the cold-brittle behavior of ultrahigh-strength and low-carbon steels and discusses them. In this work, the effect of austenitizing holding time, carbon content and temper brittleness at low temperature on the fracture behavior of ultra-high strength steel at low temperature was also studied.