Abstract

The effect of liquid carburizing at a temperature of 780°C on the micromechanical characteristics of the corrosion-resistant chromium–nickel austenitic steel (in wt %: Cr, 16.80; Ni, 8.44) has been studied in this work. According to instrumented microindentation data, it has been established that carburizing leads to the superficial hardening of the studied steel. An average increase in the indentation hardness H_IT is nearly 500%. It has been demonstrated that carburizing also leads to an increase in the contact elasticity modulus of the steel E* that grew by 28% on average compared to E* in the quenched state. The carburized steel surface is characterized by an increased resistance to elastoplastic strain as evidenced by an increase in the parameters R_e by 1.3–3.5 times, H_IT/E* by 2.4–3.5 times, and \({{H_{{{\text{IT}}}}^{3}} \mathord{\left/ {\vphantom {{H_{{{\text{IT}}}}^{3}} {{{E}^{{*2}}}}}} \right. \kern-0em} {{{E}^{{*2}}}}}\) by 49–109 times. On the contrary, the plasticity index δ_A decreases by 20% on average from 0.92–0.93 to 0.70–0.74 after carburizing. It has been shown that the instrumented indentation of the steel in the quenched state and after carburizing at different maximum indentor loads provides the possibility to perform a more precise analysis of the micromechanical characteristics of the gradient layer formed by means of carburizing by comparing them with the characteristics of the quenched steel. Based on the results of indentation at different maximum indentor loads, the gradient of properties in the thin carburized layer of up to 4 µm in depth has also been established.

中文翻译：

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低温液体渗碳对亚稳奥氏体钢微观力学性能的影响

摘要

在这项工作中，研究了温度为780°C的液体渗碳对耐腐蚀铬镍奥氏体钢（以重量％计：Cr，16.80； Ni，8.44）的微观力学特性的影响。根据仪器的显微压痕数据，已经确定渗碳会导致所研究钢的表面硬化。压痕硬度H _IT的平均增加接近500％。它已经证明，还渗碳导致的增加钢的接触弹性模量Ë *生长出由28％平均相比È*处于淬灭状态。渗碳钢表面的特点是对弹塑性应变的抵抗力增强，这可以通过参数R _e增加1.3-3.5倍，H _IT / E *增加2.4-3.5倍和\（{{H _ {{{\ text {IT}}}} ^ {3}} \ mathord {\ left / {\ vphantom {{H _ {{{\ text {IT}}}} ^ {3}} {{{E} ^ {{** 2 }}}}}} \ right。\ kern-0em} {{{E} ^ {{** 2}}}}} \） 49-109次。相反，塑性指数δ_一个渗碳后平均下降20％，从0.92-0.93降低到0.70-0.74。结果表明，在淬火状态下在不同的最大压头载荷下渗碳后，在淬火状态下进行的仪器压痕可以通过与渗碳进行比较，对通过渗碳形成的梯度层的微机械特性进行更精确的分析。淬火钢的特性。根据在不同最大压头载荷下的压痕结果，还建立了深度达4 µm的薄渗碳层中的性能梯度。