【摘要】：采用拉伸性能、顯微硬度測試及OM、SEM、TEM等實(shí)驗(yàn)方法研究了正火工藝對冷軋態(tài)低合金低溫鋼板組織演變和拉伸性能的影響。結(jié)果表明,熱處理溫度為700℃時(shí),冷軋?jiān)嚇觾H處于回復(fù)階段,鐵素體基體內(nèi)為嚴(yán)重的位錯(cuò)纏結(jié)組態(tài)和位錯(cuò)網(wǎng)格結(jié)構(gòu);正火溫度升高至750℃和800℃時(shí),冷軋組織再結(jié)晶及相變過程同時(shí)發(fā)生,以M/A小島為特征的粒狀組織出現(xiàn);860℃完全正火組織為等軸鐵素體和彌散珠光體,位錯(cuò)呈稀疏的位錯(cuò)墻組態(tài)。23%壓下率冷軋?jiān)嚇咏?jīng)860℃正火后鐵素體晶粒尺寸由10%壓下率冷軋?jiān)嚇拥?2.0μm細(xì)化到10.2μm。正火溫度為860℃時(shí),冷軋?jiān)嚇舆_(dá)到最佳的強(qiáng)塑性配合,10%和23%壓下率試樣的強(qiáng)塑積分別為20 007 MPa%、17 850 MPa%。與700℃正火試樣相比,860℃正火試樣拉伸斷口附近及頸縮區(qū)組織中微孔數(shù)量顯著降低,拉伸變形能力改善。
[Abstract]:The effects of normalizing process on the microstructure evolution and tensile properties of cold-rolled low-alloy low-temperature steel plates were studied by means of tensile properties, microhardness test and OM,SEM,TEM. The results show that the cold rolled specimens are only in the recovery stage when the heat treatment temperature is 700 鈩，

本文編號：2346810