摘要
研究了30Cr3Si2NiMoWNb超高强度钢奥氏体化后在30.0~3.5℃/min之间冷却的相变产物,及对随后低温回火后强韧性的影响。研究结果表明降低冷却速度即使形成贝氏体组织,但钢的强度高于常规油冷淬火,而韧性和塑性则有一定程度的下降;马氏体相变之前形成25%~30%的下贝氏体使低温回火后的强度进一步提高,但不影响断裂韧性;然而,相变组织中出现珠光体和上贝氏体则急剧恶化低温回火后的强度和韧性。
The phase transformation products of 30Cr3Si2NiMoWNb ultra-high strength steel cooled with rates between 30.0 -3.5 ℃/rainafter austenization, and their effect on strength and toughness in low-temperature tempering state, are studied. The results show that evenlower cooling rate leads to the formation of bainite, the strength of the steel is higher than that of the conventional oil quenched, while tileductility and plasticity are lower. The 25% - 30% percent low bainite formed before the martensitic transformation enhances the strength M＇terlow-temperature tempering, but do not lowers the fracture toughness. On the other hand, the formation of pearlite and upper bainite in phasetransformation products deteriorates rapidly the strength and toughness after low-temperature tempering.
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第2期76-79,共4页
Heat Treatment of Metals
关键词
超高强度钢
冷却速度
中间相变产物
强度
断裂韧性
ultra-high strength steel
cooling rate
intermediate phase transformation product
strength
fracture toughness
