CAJ | 학술논문

利用Gleeble-3800模拟焊接粗晶热影响区（CGHAZ）经历的热循环过程。比较了热输入100 kJ/cm条件下， V钢、V-N钢、V-Ti钢和V-N-Ti钢CGHAZ的组织和韧性，并分析了析出相情况。结果表明，CGHAZ的韧性从高到低依次为V-N-Ti钢、V-Ti钢、V-N钢和V钢；在V钢成分基础上添加钛可以有效细化原始奥氏体晶粒尺寸；V-Ti钢成分基础上增氮，一方面促进了（Ti，V）（C，N）/TiN的析出，抑制了原始奥氏体晶粒的粗化；另一方面促进了V（C，N）的析出，其促进了多边形铁素体的形成；多边形铁素体数量的增加能够减弱自由氮对韧性的破坏，同时有效改善了CGHAZ韧性。
이용Gleeble-3800모의한접조정열영향구（CGHAZ）경력적열순배과정。비교료열수입100 kJ/cm조건하， V강、V-N강、V-Ti강화V-N-Ti강CGHAZ적조직화인성，병분석료석출상정황。결과표명，CGHAZ적인성종고도저의차위V-N-Ti강、V-Ti강、V-N강화V강；재V강성분기출상첨가태가이유효세화원시오씨체정립척촌；V-Ti강성분기출상증담，일방면촉진료（Ti，V）（C，N）/TiN적석출，억제료원시오씨체정립적조화；령일방면촉진료V（C，N）적석출，기촉진료다변형철소체적형성；다변형철소체수량적증가능구감약자유담대인성적파배，동시유효개선료CGHAZ인성。
Using the Gleele-3800 to simulate the thermal cycling process of coarse grained heat affected zone(CGHAZ). When the weld heat input was 100 kJ/cm,comparing the CGHAZ microstructure and toughness of V steel,V-N steel,V-Ti steel,V-N-Ti steel,analyzed the vanadium and titanium carbon precipitation. The results show that the order of CGHAZ toughness from high to low is V-N-Ti steel,V-Ti steel,V-N steel and V steel;Adding Ti to V steel can effective-ly decrease the original austenite size;On one hand,increasing the nitrogen based on the V-Ti steel can promote the(Ti, V)(C,N)/TiN formed which can decrease the austenite size. On the other hand,increasing the nitrogen can promote the V (C,N)formed which can promote the polygonal ferrite formed. The polygonal ferrite can partly remedy the detrimental effect of the free N atoms and improve the CGHAZ toughness.