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采用SEM、TEM及微拉伸试验等方法,对深冷轧制变形90%的AISI310S奥氏体不锈钢不同温度(500~1000℃)及时间(2~60 min)退火处理后的微观组织及性能进行了研究。结果表明:当退火温度在700℃以下时,深冷变形组织处于回复阶段;退火温度在700℃以上时,深冷变形组织处于再结晶阶段,随着退火温度升高至1000℃,再结晶程度充分完全的同时伴随着再结晶晶粒的长大,1000℃退火10 min条件下,奥氏体晶粒长大至3μm左右。在退火温度800℃下,随着退火时间从2 min增加到60 min,奥氏体不锈钢晶粒尺寸从300 nm增大至750 nm。退火温度从500℃增至1000℃,奥氏体不锈钢的强度和硬度呈现出先升高后下降的趋势,伸长率则一直呈增加趋势,断口形貌也由韧、脆性混合断裂向韧性断裂发生转变。
The microstructure and properties of AISI310S austenitic stainless steel after 90% cold rolling were annealed at different temperatures (500 ~ 1000 ℃) and time (2 ~ 60 min) using SEM, TEM and microtensile test. Were studied. The results show that when the annealing temperature is below 700 ℃, the microstructure is in the recovery stage. When the annealing temperature is above 700 ℃, the microstructure is in the recrystallization stage. As the annealing temperature increases to 1000 ℃, the degree of recrystallization Full and complete at the same time with recrystallization grain growth, annealing at 1000 ℃ for 10 min conditions, the austenite grains grow to about 3μm. The austenitic stainless steel grain size increased from 300 nm to 750 nm with the annealing time increasing from 2 min to 60 min at annealing temperature of 800 ℃. Annealing temperature increased from 500 ℃ to 1000 ℃, the strength and hardness of austenitic stainless steel showed the first increase and then decline, the elongation has been an increasing trend, fracture morphology from ductile, brittle mixed fracture to ductile fracture occurred change.