Effect of Heat Treatment on Microstructure and Mechanical Properties of Cr31 Hypereutectic Cast Iron

2015 ◽  
Vol 740 ◽  
pp. 36-42
Author(s):  
Chuan Xiao Peng ◽  
Wen Chao Cui ◽  
Xiao Yan Yang ◽  
Li Wang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Retained Austenite ◽  
Wear Property ◽  
Erosion Wear ◽  
Microstructure And Mechanical Properties ◽  
Bulk Hardness ◽  
Chromium Cast Iron ◽  
Carbide Product

The effect of destabilization at (960°C,1000°C,1050°C) followed by sub-critical heat treatment (SCHT) at (260°C, 450°C, 550°C) on microstructure and mechanical properties of a hypereutectic chromium cast iron containing 31 wt.% Cr was investigated. The response of the microstructure of the specimens differed significantly to heat treatment. With increasing destabilization temperature, the amount of retained austenite increased and it became more stable during following SCHT. The peak values of bulk hardness deceased with increasing destabilization temperature, while higher SCHT was needed to reach the hardness maximum. The hardness and erosion wear property of the specimens destabilization at 960°C or 1000°C deteriorated after SCHT at 550°C due to the formation of ferrite/carbide product, which was not found in the specimens destabilization at 1050°C followed by SCHT at 550°C. The specimen destabilization at 960°C + SCHT at 260°C performed best erosion wear resistance with matrix of martensite containing little austenite.

scholarly journals Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-alloyed Hypereutectic High Chromium Cast Iron

2012 ◽  
Vol 52 (12) ◽  
pp. 2288-2294 ◽  
Author(s):  
Qiang Liu ◽  
Peter Hedstr^|^ouml;m ◽  
Hongwei Zhang ◽  
Qiang Wang ◽  
P^|^auml;r G. J^|^ouml;nsson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Microstructure And Mechanical Properties ◽  
Chromium Cast Iron

The Effects of Heat Treatment on Microstructure and Mechanical Properties of AISI 4140 for Base Cutter Cane Harvester

2013 ◽  
Vol 774-776 ◽  
pp. 1059-1067 ◽  
Author(s):  
Wichan Chuaiphan ◽  
Loeshpahn Srijaroenpramong ◽  
Dumrongrit Pinpradub
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Quenching Condition ◽  
Microstructure And Mechanical Properties ◽  
Aisi 4140 ◽  
Air Medium ◽  
Tempering Process

The effects of heat treatment on microstructure and mechanical properties of AISI 4140 for base cutter cane harvester were studied. The effect of heat treatment - i.e. the different quenching medium (water, oil and air mediums) and the different heat treatment condition (quenching, quenching+tempering, cover scrap cast iron+ quenching and cover scrap cast iron+ quenching+tempering) on the on microstructure and mechanical properties (hardness, impact toughness and bend test). The material AISI 4140 was purchased from local market in Thailand and an emission spectroscopy was applied to quantify the amount of elements in steel. The specimens were heat treated in an induction furnace. The resultant microstructure of materials AISI 4140 consists of martensite and retained austenite after quenching all mediums, which quenching in water it have more than in oil and air medium respectively. The microstructure of materials AISI 4140 after tempering process consists of bainitic structure (ferrite and epsilon carbide) and retained austenite, which tempering in water quenching condition it have more than in oil and air quenching condition respectively. The hardness, impact toughness and bended test are according to behavior heat transfer of quenching mediums. The material alloy steel grade AISI 4140 is the good candidates to promote the quenching in water ,oil and air medium and must be continuous to tempering process. The technique heating by cover scrape cast iron it was good for protected surface and decreased decarburization on surface of steels. But it is not necessary for control microstructure and mechanical properties.

Microstructure and Mechanical Properties of a Nb-Microalloyed Medium Carbon Steel Treated by Quenching-Partitioning Process

2012 ◽  
Vol 531-532 ◽  
pp. 596-599
Author(s):  
Kai Zhang ◽  
Shang Wen Lu ◽  
Yao Hui Ou ◽  
Xiao Dong Wang ◽  
Ning Zhong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electron Microscope ◽  
Carbon Steel ◽  
Retained Austenite ◽  
High Strength ◽  
Medium Carbon Steel ◽  
Orientation Relationships ◽  
Medium Carbon ◽  
Microstructure And Mechanical Properties

The recently developed “quenching and partitioning” heat treatment and “quenching-partitioning-tempering” heat treatment are novel processing technologies, which are designed for achieving advanced high strength steels (AHSS) with combination of high strength and adequate ductility. In present study, a medium carbon steel containing Nb was subjected to the Q-P-T process, and both the microstructure and mechanical properties was studied. The experimental results show that the Nb-microalloyed steel demonstrates high tensile strength and relatively high elongation. The microstructure of the steel was investigated in terms of scanning electron microscope and transmission electron microscope, and the results indicate that the Q-P-T steel consist of fine martensite laths with dispersive carbide precipitates and the film-like interlath retained austenite. The orientation relationships between martensite and retained austenite is as well-known Kurdjurmov-Sachs relationship and Nishiyama-Wasserman relationship.

Study on Erosion Wear Property of Nickel-Chromium Cast Iron

2011 ◽  
Vol 117-119 ◽  
pp. 1084-1087
Author(s):  
Jing Pei Xie ◽  
Ai Qin Wang ◽  
Wen Yan Wang ◽  
Luo Li Li
Keyword(s):  
Cast Iron ◽  
Strong Acid ◽  
Impact Angle ◽  
Wear Loss ◽  
Test Machine ◽  
Wear Property ◽  
Erosion Wear ◽  
Nickel Chromium ◽  
The Impact ◽  
Chromium Cast Iron

Erosion wear experiments on Nickel-Chromium cast iron were tested by MCF-30 erosion test machine. The structure and surface morphology of these samples were analyzed by Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and XRD. The influences of the impact angle and acidity on erosion wear property were analyzed. The discipline of the erosion wear property was discussed as well. The experimental results indicate that after oil quench at 960°C and temper at 250°C, the alloy carbide (Fe, Cr)3C which works as the wear resistance skeleton distributes uniformly in the matrix ; the shape of erosion wear curve is “M”. and the biggest wear loss is when the impact angle is 60°; the erosion wear property is affected greatly by the strong acid, but is little even can be ignored when pH≥3. The erosion wear mechanism of Nickel-Chromium cast iron is selective wear.

Effects of Vanadium and Rare-Earth on Carbides and Properties of High Chromium Cast Iron

2008 ◽  
Vol 575-578 ◽  
pp. 1414-1419 ◽  
Author(s):  
Wen Min Zhao ◽  
Zhen Xu Liu ◽  
Zi Lai Ju ◽  
Bo Liao ◽  
Xue Guang Chen
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rare Earth ◽  
Cast Iron ◽  
Treatment Technology ◽  
High Chromium ◽  
Shape Distribution ◽  
High Chromium Cast Iron ◽  
Heat Treatment Technology ◽  
Chromium Cast Iron

The type, shape and distribution of carbide take directly effect on the mechanical properties of high chromium castings. Vanadium is able to stabilize the structure of carbide in high chromium cast iron, meanwhile the hardness of carbide containing vanadium can reaches about 2800HV. In some cases, vanadium can also refine the microstructure. Rare-earth is able to change the shape of carbide in cast iron, refine the grain size of ferrite and improve the mechanical properties of castings. In this experiment, intention of adding vanadium and rare-earth is modification of mechanical properties with the proper heat treatment technology. With the help of SEM, the characteristics of carbide, such as shape, distribution and quantity can be observed and mechanical properties have been improved for better wear-resistance.

Effect of Rare Earths and Vanadium on Microstructure and Mechanical Properties of High Chromium Cast Iron

2013 ◽  
Vol 744 ◽  
pp. 357-361
Author(s):  
Yun Long Ai ◽  
Qing Long ◽  
Wei Hua Chen ◽  
Bing Liang Liang
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Wear Test ◽  
X Ray Diffraction ◽  
High Chromium ◽  
X Ray ◽  
High Chromium Cast Iron ◽  
Microstructure And Mechanical Properties ◽  
Proper Modification ◽  
Chromium Cast Iron

Effect of RE and V on microstructure and mechanical properties of high chromium cast iron were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, impact test and wear test. The results show that proper modification using RE combined with V makes the alloy present a more refined and homogenous austenite matrix, and makes the morphology of carbide changing from thick lath to thin lath, and rosette-like. Modification can also increase hardness, wear resistance and impact toughness of high chromium cast iron.

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