实验研究了超低碳TiIF钢性能和析出相，结果表明：超低碳TiIF钢具有低的屈强比、高塑性、高应变硬化性能和高成形性能，其屈强比约为0.5，抗拉强度为310 MPa，屈服强度为155 MPa，伸长率47%～50%，应变硬化指数n值为0.26～0.28，塑性应变比r值均在2.0左右，最高r值达2.25。退火织构特征均表现为较强的γ纤维织构和较弱的α纤维织构，γ纤维织构主要为{111}<110>和{111}<112>，最强点在{111}<110>处，有利的{111}取向织构使TiIF钢具有优异的深冲性能。在超低碳钢中加入微量的Ti，形成碳化物、氮化物和氮碳化物，可以固定间隙原子（如C、N原子），获得无间隙原子钢，同时，适量固溶Ti，能显著提高钢的深冲性能。析出相主要有Ti(N,C)及TiC ，Ti2CS， Ti3S4及很少量的AlN，而粗大稀疏的Ti2CS等析出相对晶界的钉扎力小，相应的促进了{111}再结晶织构的发展，从而获得较高的r值。
A research on proper ties and precipitate of the TiIF steel are made in this article.The tested result showed that the TiIF steel behaves high rvalue,nvalue and ductility,while its ratio of yield strength to tensile strength is low.The annealed texture is consist of strongγ fiber and weak α fiber texture,the former nostly composed of {111}<110> texture and {111}<112> texture,the {111}<110> texture becomes dominant after annealing,which is beneficial to formability.The Ti is used to stabilize the interstitial atoms,which is beneficial to deepdrawing.The main precipitates are consist of Tic,Ti2CS,Ti3S4,which has litter restraint at the grain boundary.The coarse and sparse precipitate such as Ti3CS is the origin of excellent drawability.
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