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首页> 外文期刊>Materials Science and Engineering >Evolution of microstructure and its influence on tensile properties in thermo-mechanically controlled processed (TMCP) quench and partition (Q & P) steel
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Evolution of microstructure and its influence on tensile properties in thermo-mechanically controlled processed (TMCP) quench and partition (Q & P) steel

机译：热机械控制淬火和分隔（Q＆P）钢的组织演变及其对拉伸性能的影响

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摘要

Controlled hot rolling is performed on low carbon Q&P steel and is subsequently followed by a direct Q&P (DQP) treatment and a separate Q&P treatment (SQP). Two different levels of strain viz. 0.51 and 1.1 are accomplished in the thermomechanical controlled process (TMCP) prior to the Q&P treatment. The micro-structures of the steels processed through both the DQP and SQP methods with different thickness reductions, contain primarily small lath packets with fine martensite laths and thin films of inter-lath austenite. Comparatively higher martensite volume fractions and fine lath packets is noticed in the DQP method. Tendency of higher retained austenite fraction is observed in the SQP method. Presence of a high fractions of high angle grain boundaries (HAGB) in the martensite laths indicates a fully recrystallized prior austenite grains in both steels. In general, prior thermo-mechanical treatment improves the partition kinetics which is supported by the high value of calculated carbon content of the austenite, C_T, in the DQP steels. Combination of TMCP and Q&P process has resulted in remarkable increase in strength with adequate ductility compared to a simple Q&P treatment alone. Maximum strength of about 1398 MPa with a total elongation of 14% is achieved in the 1.1DQP steel. The study suggests that performing a TMCP prior to Q&P promotes grain refinement and formation of high fractions of HAGBs that are beneficial to improve the tensile properties.
机译：在低碳Q＆P钢上进行受控的热轧，随后进行直接Q＆P（DQP）处理和单独的Q＆P处理（SQP）。两种不同水平的应变。在Q＆P处理之前，可通过热机械控制过程（TMCP）实现0.51和1.1。通过DQP和SQP方法加工的钢的微观结构，具有不同的减薄厚度，主要包含具有细马氏体板条和板条间奥氏体薄膜的小板条组。在DQP方法中，马氏体体积分数和细板条含量相对较高。在SQP方法中观察到较高的残余奥氏体分数的趋势。马氏体板条中存在高比例的高角晶界（HAGB），这表明两种钢中的完全重结晶的先前奥氏体晶粒。通常，在DQP钢中，现有的热机械处理可改善分配动力学，这是由奥氏体C_T的高碳含量计算值所支持的。与单独的简单Q＆P处理相比，TMCP和Q＆P工艺的组合可显着提高强度并具有足够的延展性。 1.1DQP钢的最大强度约为1398 MPa，总伸长率为14％。研究表明，在Q＆P之前执行TMCP可以促进晶粒细化和形成高比例的HAGB，这有利于改善拉伸性能。

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