發(fā)布時(shí)間：2019-07-24 11:43

【摘要】：對80 mm厚S355鋼板進(jìn)行應(yīng)變時(shí)效沖擊試驗(yàn),從微觀組織上對材料高應(yīng)變時(shí)效敏感系數(shù)的原因進(jìn)行了分析。結(jié)果表明:應(yīng)變時(shí)效前后材料的組織未發(fā)生明顯的改變,珠光體的含量較高,呈塊狀或球狀,尺寸較小且分布較彌散。應(yīng)變時(shí)效后,0~-60℃的沖擊功均有一定程度的下降。在-20~-40℃具有較高的應(yīng)變時(shí)效敏感性系數(shù),高達(dá)70%以上。應(yīng)變時(shí)效后位錯(cuò)密度大大增加。應(yīng)變時(shí)效前位錯(cuò)分布均勻,應(yīng)變時(shí)效后,位錯(cuò)纏結(jié),位錯(cuò)的可動(dòng)性大大降低,對材料的韌性造成很大的損害。時(shí)效溫度附近出現(xiàn)的內(nèi)耗峰是由于間隙C原子與位錯(cuò)釘扎和脫釘作用所致的結(jié)果。
[Abstract]:The strain aging impact test of 80 mm thick S355steel plate was carried out, and the reasons for the high strain aging sensitivity coefficient of the material were analyzed from the microstructure. The results show that the microstructure of the material does not change obviously before and after strain aging, the content of pearlite is high, it is bulk or spherical, the size is small and the distribution is dispersed. After strain aging, the impact work at 0 / 60 鈩，

本文編號(hào)：2518623