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Improvement in Mechanical Properties and Wear Resistance of 13Cr–4Ni Martensitic Steel by Cyclic Heat Treatment
Transactions of the Indian Institute of Metals ( IF 1.5 ) Pub Date : 2020-08-14 , DOI: 10.1007/s12666-020-02043-2
Jai Singh , S. K. Nath

13Cr–4Ni martensitic stainless steel was subjected to a cyclic heat treatment (CHT) by using Gleeble 3800, thermo-mechanical simulator. A single cycle of this heat treatment consisted of austenitization at 1000 °C, holding for 5 min and fast cooling to room temperature. The effects on microstructure and mechanical properties were studied after conducting two (1000-2c) and four such cycles (1000-4c). The wear behavior of the cyclic heat-treated and the as-received material was then investigated by conducting dry sliding wear tests on a pin-on-disk wear testing machine. The evolved microstructure after CHT consisted of a reduced fraction of undesiring δ-ferrite and retained austenite phases and thereby an increased fraction of martensitic. Along with this, refinement in the martensite blocks attributed the increased hardness (by 46%) and ultimate tensile strength (by 41%) with a slight loss of ductility. The wear resistance of cyclic heat-treated specimens was found to be 41%, 18%, and 19% higher at 10 N, 20 N, and 30 N loads, respectively, than the counterpart of the as-received specimen. The plowing and craters were found responsible for the material removal from the surface of both as-received and cyclic heat-treated specimens.



中文翻译:

通过循环热处理改善13Cr-4Ni马氏体钢的力学性能和耐磨性

使用热力模拟器Gleeble 3800对13Cr-4Ni马氏体不锈钢进行了循环热处理(CHT)。该热处理的单个循环包括在1000°C下奥氏体化,保持5分钟并快速冷却至室温。在进行两个(1000-2c)和四个这样的循环(1000-4c)之后,研究了对微观结构和机械性能的影响。然后,通过在销钉盘式磨损试验机上进行干式滑动磨损试验,研究了经循环热处理和按原样处理的材料的磨损行为。CHT后形成的显微​​组织包括减少的不希望有的δ铁素体和残留的奥氏体相,从而增加了马氏体的分数。伴随着这个 马氏体块体的细化归因于硬度(增加了46%)和极限抗拉强度(增加了41%)而延展性略有下降。发现在10 N,20 N和30 N的载荷下,循环热处理试样的耐磨性分别比收到的试样高41%,18%和19%。发现犁和坑是造成已接收样品和循环热处理样品表面材料去除的原因。

更新日期:2020-08-14
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