CAJ | 학술논문

模拟汽车板的烘烤工艺，研究了预变形量、烘烤温度和烘烤时间等对含铌低硅T RIP钢板组织和性能的影响，探讨了T RIP钢的烘烤硬化机理。结果表明，当预变形量小于4％时，烘烤硬化值随预变形量增大而增加，预变形量大于4％时反而降低了烘烤硬化效应；当烘烤温度低于170℃时，随烘烤温度的上升，烘烤硬化值明显增加，当烘烤温度高于170℃时，烘烤温度对烘烤硬化值影响不大；当烘烤时间在20 m in以内时，随烘烤时间的延长，烘烤硬化值显著增加，烘烤时间超过20 m in时，烘烤硬化值随烘烤时间的延长反而有所降低。通过对TRIP钢的烘烤硬化机理分析，建立了烘烤硬化值变化模型：ΔYBH ＝ΔYγ＋ΔYb＋ΔYγc＋ΔYdp＋ΔYc ，其中沉淀析出碳氮化物数量和Cottrell气团数目变化引起的ΔY dp＋ΔYc对烘烤硬化值变化影响相对显著。
모의기차판적홍고공예，연구료예변형량、홍고온도화홍고시간등대함니저규T RIP강판조직화성능적영향，탐토료T RIP강적홍고경화궤리。결과표명，당예변형량소우4％시，홍고경화치수예변형량증대이증가，예변형량대우4％시반이강저료홍고경화효응；당홍고온도저우170℃시，수홍고온도적상승，홍고경화치명현증가，당홍고온도고우170℃시，홍고온도대홍고경화치영향불대；당홍고시간재20 m in이내시，수홍고시간적연장，홍고경화치현저증가，홍고시간초과20 m in시，홍고경화치수홍고시간적연장반이유소강저。통과대TRIP강적홍고경화궤리분석，건립료홍고경화치변화모형：ΔYBH ＝ΔYγ＋ΔYb＋ΔYγc＋ΔYdp＋ΔYc ，기중침정석출탄담화물수량화Cottrell기단수목변화인기적ΔY dp＋ΔYc대홍고경화치변화영향상대현저。
In order to simulate baking process of automobile steel sheet ,baking treatment experiments at different pre-strains ,temperatures and times were carried out on low silicon TRIP steel with Nb . T he variation of the microstructures and bake-hardening values of the experimental steel during bak-ing treatment was investigated ,and the bake-hardening mechanism of TRIP steel was discussed .A model of variation of the bake-hardening value was built as follows :ΔYBH = ΔYγ + ΔYb+ ΔYγc+ΔYdp+ ΔYc ,in which effects of ΔYdp and ΔYc on the variation of the bake-hardening value (ΔYBH) are relatively strong ,which are the yield strength variations caused by the amount of carbide precipi-tation and Cottrell atmosphere .