本文選題：耐熱鋼 + CrNiMoVN�。� 參考：《鋼鐵研究學(xué)報》2017年02期

【摘要】：利用金相顯微鏡、掃描電鏡和透射電鏡等研究了1Cr12Ni3Mo2VN耐熱鋼的回火工藝,結(jié)果指出試驗鋼產(chǎn)生第一類回火脆性的主要原因是馬氏體板條界存在聚集長大的Fe_3C及M_3C脆性相,導(dǎo)致沖擊韌性顯著下降。Mo_2C與基體處于共格狀態(tài),使基體周圍晶格產(chǎn)生很大的靜畸變是次要原因;產(chǎn)生第二類回火脆性的原因,一是由于碳化物M_(23)C_6沿原奧氏體晶界和馬氏體板條界迅速聚集并粗化,二是板條間殘余奧氏體膜因碳貧化而發(fā)生熱失穩(wěn)分解。結(jié)合技術(shù)協(xié)議要求,為了有利于組織的穩(wěn)定性,本試驗鋼的最佳回火工藝為580℃×2h空冷。
[Abstract]:The tempering process of 1Cr12Ni3Mo2VN heat-resistant steel was studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the main reason for the first type tempering brittleness of test steel is the existence of Fe_3C and M3C brittleness phases in martensite lath boundary. As a result, the impact toughness decreased significantly. Mo2C was in a coherent state with the matrix, resulting in a large static distortion of the lattice around the matrix, and the second kind of tempering brittleness was caused by the second type of tempering brittleness. One is the rapid accumulation and coarsening of carbides M_(23)C_6 along the original austenite grain boundary and martensite lath boundary, and the other is the thermal instability decomposition of the residual austenite film between the lath due to carbon depletion. According to the requirement of technical agreement, the optimum tempering process of this steel is 580 鈩，

本文編號：1777686