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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Influence of different heat treatment parameters on microstructure and mechanical properties of C-Mn strapping quality steels
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Influence of different heat treatment parameters on microstructure and mechanical properties of C-Mn strapping quality steels

机译：不同热处理参数对C-Mn系带优质钢组织和力学性能的影响

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摘要

Strap steel produced at Bokaro Steel Plant is a plain C-Mn (nominal chemistry C: 0.35%, Mn: 1.35% and Si: 0.25%) cold rolled steel that is austenitised at 930 ℃ and austempered in a lead bath at 450 ℃. The microstructure consists of ferrite, pearlite and bainite also to achieve ultimate tensile strength (UTS) 900MPamin and elongation 8%min on 150 mm gauge length. In order to achieve such a microstructure consistently, influence of chemistry and different heat treatment parameters on strapping quality steels have been studied. It has been found in the laboratory that increase in Mn (from 1.35 to 1.55%) and Si (from 0.25 to 0.45%) in a 0.32% C strap steel results in 100% bainite in the microstructure after austenitisation and subsequent air cooling. The austempering of the modified strap steel (0.4% C, 1.65% Mn and 0.5% Si) at Bokaro Steel Plant results in excessively high UTS (1040-1100 MPa) without affecting the elongation value (8-10%, 150 mm GL). The microstructure of the austempered straps of modified chemistry consists of cent percent bainite. The austenitisation and subsequent air cooling without austempering of the modified strap steel result in a microstructure consisting of ferrite, pearlite and bainite. The UTS (867-875 MPa) achieved marginally falls short of the specified values (900 MPa min) while % elongation values (8-10%, 150mm GL) conform to the IRS: P-41 specification.
机译：Bokaro钢铁厂生产的带钢是普通的C-Mn（名义化学C：0.35％，Mn：1.35％和Si：0.25％）冷轧钢，在930℃时奥氏体化，并在450℃的铅浴中进行奥氏体化。显微组织由铁素体，珠光体和贝氏体组成，在150 mm的标距上也能达到900MPamin的极限拉伸强度（UTS）和8％min的伸长率。为了始终如一地获得这样的显微组织，已经研究了化学性质和不同的热处理参数对捆扎优质钢的影响。在实验室中发现，在0.32％的C带钢中，Mn（从1.35到1.55％）和Si（从0.25到0.45％）的增加会在奥氏体化和随后的空气冷却后在显微组织中产生100％的贝氏体。在Bokaro钢铁厂对改性带钢（0.4％C，1.65％Mn和0.5％Si）的奥氏体回火会导致UTS（1040-1100 MPa）过高，而不会影响伸长率值（8-10％，150 mm GL） 。化学改性的奥氏体钢带的微观结构由百分之百的贝氏体组成。奥氏体化和随后的空气冷却而不对改性带钢进行奥氏体回火，导致组织由铁素体，珠光体和贝氏体组成。达到的UTS（867-875 MPa）略低于指定值（900 MPa min），而伸长率％（8-10％，150mm GL）符合IRS：P-41规范。

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