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Effect of Tempering Temperature on Strength and Fracture Toughness of 0.3C-CrMoV(ESR) Steel

机译:回火温度对0.3C-CrMoV(ESR)钢强度和断裂韧性的影响

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摘要

0.3C-CrMoV(ESR) steel is an ultra-high strength low alloy steel indigenously developed by ISRO for space applications. The steel is used in the form of rings of 2.8 m diameter also. In this paper, the effect of tempering temperature on ring rolled steel for the best combination of fracture toughness and strength properties is studied. The tensile properties and fracture toughness of the steel were evaluated in the as quenched and tempered conditions through the specimens drawn in radial direction of the ring segment. Five tempering temperatures were used in the study: 200, 450, 475, 500 and 510℃. Tensile strength of the steel showed continuous decrease with increasing tempering temperature, but yield strength increased reaching maximum when tempered at 450℃ and further decreased with increasing tempering temperature. The elongation was higher for higher tempering temperature. The strain hardening exponent decreased with increasing tempering temperature. The fracture toughness test results showed that tempering between 475 and 510℃ exhibited better combination of fracture toughness and strength.
机译:0.3C-CrMoV(ESR)钢是ISRO专门为太空应用开发的超高强度低合金钢。该钢也以直径为2.8 m的环的形式使用。本文研究了回火温度对环轧钢的断裂韧性和强度性能的最佳组合的影响。通过在环段的径向上绘制的样品,在淬火和回火条件下评估了钢的拉伸性能和断裂韧性。研究中使用了五个回火温度:200、450、475、500和510℃。钢的抗拉强度随着回火温度的升高而持续降低,但屈服强度在450℃回火时达到最大值,并随回火温度的升高而进一步降低。对于较高的回火温度,伸长率较高。应变硬化指数随回火温度的升高而降低。断裂韧性测试结果表明,在475℃至510℃之间回火表现出更好的断裂韧性和强度组合。

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