【摘要】 初步探讨正火热处理和应变循环加载对16Mn延性断裂韧度JⅠC的影响。实验结果表明,16Mn热轧钢板正火后延性断裂韧度JⅠC大约是正火前3倍左右,应变循环加载对钢材的延性断裂韧度JⅠC的影响是很明显的,钢材单调拉伸0.3%应变后,延性断裂韧度JⅠC均比未经单调拉伸0.3%应变时降低了11%。控制±0.3%全应变的循环加载500周后,延性断裂韧度JⅠC比未经单调拉伸0.3%应变时钢的延性断裂韧度JⅠC提高了15%,产生相反的差异的原因还有待于进一步的研究。更多还原

【Abstract】 A preliminary investigation was made in this research to test the influence of cyclic strain on JⅠC-the ductile fracture toughness of steels.The test results showed that the ductile fracture toughness JⅠC of hot-rolled 16Mn steel is about 3 times than no normalizing,the influence of cyclic strain to fracture toughness of 20G steels is obvious,after drawing 0.3% strain,the ductile fracture toughness of them are all decreased 11%.The cyclic strain loading controlled within a total strain of ±0.3% after 500 cycles,compared with the no drawing 0.3% strain steels,the ductile fracture toughness are raised 15%,the reason for the converse difference is worth further research.更多还原